Apostasy
The teaching, once saved, always saved, is very common nowadays although there are many passages in the New Testament which show that it is possible for a Christian to fall away from God. This question is closely connected with how we understand God’s love, the freedom and nature of man, the consequences of salvation, the importance of fighting against sin, and sanctification. It is vital for every Christian to clearly understand this matter.

Apostasy does not only occur when someone consciously stops believing in God, but can also be the result of long-term, persistent sinning. Gradual backsliding into sin can also lead to apostasy.
Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. (Hebrews 3:12)
We live in a relationship with God
The living God has a living relationship with his children. He created us as free persons, and he does not treat us like puppets but he respects our decisions, even when they have bad or tragic consequences. Just as we can freely decide to live with God, we can also decide to turn away from Him. The New Testament clearly speaks of the danger of losing the grace of salvation through the deceit of sin and of ending up in blindness and darkness: being lost. We thus understand apostasy as the loss, or rejection, of the relationship with God.
“I am the true vine, and my Father is the vine dresser. Every branch in me that does not bear fruit he takes away, and every branch that does bear fruit he prunes, that it may bear more fruit. Already you are clean because of the word that I have spoken to you. Abide in me, and I in you. As the branch cannot bear fruit by itself, unless it abides in the vine, neither can you, unless you abide in me. I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing. If anyone does not abide in me he is thrown away like a branch and withers; and the branches are gathered, thrown into the fire, and burned. (John 15:1–6)
A branch can bear fruit only if it remains in the vine: the branch has a living connection to the vine. Jesus spoke about people who have a relationship with him. Every branch that bears no fruit will be cut off and burnt in the fire. Whoever does not remain in the relationship with him becomes fruitless and, figuratively speaking, will be cut off and burnt. The words of Jesus here make it clear that it is possible to lose one’s relationship with him.
The letter to the Hebrews
For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit, and have tasted the goodness of the word of God and the powers of the age to come, and then have fallen away, to restore them again to repentance, since they are crucifying once again the Son of God to their own harm and holding him up to contempt. For land that has drunk the rain that often falls on it, and produces a crop useful to those for whose sake it is cultivated, receives a blessing from God. But if it bears thorns and thistles, it is worthless and near to being cursed, and its end is to be burned. (Hebrews 6:4–8)
When people who once repented had been enlightened and shared in the Holy Spirit fall back into a life of sin, they crucify, in figurative sense, the Son of God again. They deny the power of salvation because Jesus leads believers to freedom from sins. People like this cannot repent again. Expressions like “have shared in the Holy Spirit” and “to restore them again to repentance” can only be written about somebody who had repented. “Crucifying once again the Son of God” implies that the person in question already received salvation. “To taste the heavenly gift” does not mean to only get a taste of it (to get in touch without repentance), just as in Hebrews 2:9 it does not mean that Jesus did not really die (“he tasted death”).
For if we go on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a fearful expectation of judgement, and a fury of fire that will consume the adversaries. Anyone who has set aside the law of Moses dies without mercy on the evidence of two or three witnesses. How much worse punishment, do you think, will be deserved by the one who has spurned the Son of God, and has profaned the blood of the covenant by which he was sanctified, and has outraged the Spirit of grace? For we know him who said, “Vengeance is mine; I will repay.” And again, “The Lord will judge his people.” It is a fearful thing to fall into the hands of the living God. (Hebrews 10:26–31)
These verses speak again about Christians who “received the knowledge of the truth”—the author also considering himself to be one of them. An “expectation of judgment and a fury of fire that will consume the adversaries” can only refer to people who are eternally separated from God. The expression ”there no longer remains a sacrifice for sins” shows that they already accepted the sacrifice of Jesus, and the same is meant by the blood of the covenant.
According to this passage, Christians can lose their salvation if they continue sinning deliberately.
Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day, as long as it is called “today”, that none of you may be hardened by the deceitfulness of sin. (Hebrews 3:12–13)
This verse urges the readers to be watchful over their brothers and sisters. We can see that there can be a close connection between apostasy and an irresponsible attitude of believers to each other.
Sometimes people claim that these passages do not refer to Christians but to “lip-worshipers” who are standing in front of the decision to become Christians. In fact, the whole letter speaks to and about brothers in faith.
And we desire each one of you to show the same earnestness to have the full assurance of hope until the end, so that you may not be sluggish, but imitators of those who through faith and patience inherit the promises. (Hebrews 6:11–12)
The addressees of this letter are encouraged to endure till the end, not to become lazy on the good way which they had begun. The writer of the letter calls them brothers when he is admonishing them (e.g., Hebrews 3:12). He saw some of them were quite weak in faith, but he still believed they were Christians. They were in danger of neglecting fellowship and of being hardened by sin. As former Jews (“Hebrews”), they felt strongly attracted by the temple cult, which they were used to. They had forgotten the purification they experienced because of their lukewarmness and fear of suffering. (Hebrews 10:23–29)
This is why there are many warnings in this letter in which Christians are addressed that they may lose the grace they had received.
False teachings causing apostasy
You who are trying to be justified by the law have been alienated from Christ; you have fallen away from grace. (Galatians 5:4)
The letter to the Galatians is a good example of how a false teaching can lead to apostasy. At the beginning of the letter Paul expresses that he is alarmed about the Galatians because they allowed themselves to be drawn away to “another gospel” so easily (Galatians 1:6–9). The deceivers were Jews who insisted that the Gentiles who became Christians must keep the law of Moses.
It was obvious for Paul that turning to formalistic rituals meant “falling away from grace.” If salvation is given by God’s grace, falling from grace means the loss of salvation, i.e., apostasy.
In Galatians 4:11 Paul expresses his worries that perhaps he labored on them in vain. If apostasy were impossible, his worries would be completely out of place.
Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons, (1 Timothy 4:1)
Young Christians were confronted with another dangerous heresy, an early form of gnosis (1 Timothy 6:20) which led some of them away from their faith and led them to the shipwreck of their belief. This was the case with Hymenaeus and Philetus (1 Timothy 1:18–20, 2 Timothy 2:17).
Greed and all sorts of desires led some believers away from the faith too. (1 Timothy 6:6–10, 1 Timothy 5:5–14).
The first letter of John
In some cases it happened that some who turned away from the faith had not been Christians before.
Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come. Therefore we know that it is the last hour. They went out from us, but they were not of us; for if they had been of us, they would have continued with us. But they went out, that it might become plain that they all are not of us. (1 John 2:18–19)
The expression “antichrist” shows that the persons in question spread heresies and were not simply unfaithful believers. Gnostics used expressions similar to those of Christians, in a misleading way, which they filled with a completely different content. It could have been difficult for young Christians, who were not yet firm enough in the right teachings, to see them through. That is a highly probable reason why John wanted to emphasize: these people had never really repented.
If anyone sees his brother committing a sin not leading to death, he shall ask, and God will give him life — to those who commit sins that do not lead to death. There is sin that leads to death; I do not say that one should pray for that. (1 John 5:16)
John assumes that Christians might commit a sin that will cause their spiritual death. Some consistent opponents of apostasy suppose that John meant physical death in this verse. This explanation, however, does not fit in any way.
Encouragements to endure
Many passages in the New Testament encourage Christians to endure in obedience to God.
Brother will deliver brother over to death, and the father his child, and children will rise against parents and have them put to death, and you will be hated by all for my name’s sake. But the one who endures to the end will be saved. (Matthew 10:21–22)
A few others: 1 Corinthians 15:1–2; Colossians 1:21–23; Hebrews 10:35–39.
If apostasy has no final consequences or is not possible, why do so many biblical texts stress the importance of persevering to the end? God, who always speaks the truth, would not use empty threats in order to lead his children to obedience! Even teachers would agree that this kind of education is unacceptable.
The Old Testament also clearly shows that it is not enough to be righteous for some time and then to turn away from the truth.
But when a righteous person turns away from his righteousness and does injustice and does the same abominations that the wicked person does, shall he live? None of the righteous deeds that he has done shall be remembered; for the treachery of which he is guilty and the sin he has committed, for them he shall die. (Ezekiel 18:24)
Nothing can separate us from God
What then shall we say to these things? If God is for us, who can be against us? He who did not spare his own Son but gave him up for us all, how will he not also with him graciously give us all things? Who shall bring any charge against God’s elect? It is God who justifies. Who is to condemn? Christ Jesus is the one who died — more than that, who was raised — who is at the right hand of God, who indeed is interceding for us. Who shall separate us from the love of Christ? Shall tribulation, or distress, or persecution, or famine, or nakedness, or danger, or sword? […] For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord. (Romans 8:31–35,38–39)
This passage is about God’s faithfulness to his children. If a Christian remains faithful to God, nothing can separate him from God. It is God’s plan that each Christian remains firm to the end, and he gives each of us the necessary strength to do this.
This passage does not deal with the question about what happens if this person is no longer ready to fight against sin. We cannot expect that each promise of God is accompanied by a list of conditions.
And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day. (John 6:39)
God does not want any Christian to be lost but he still does not take away our free will. This passage does not speak about somebody’s sad development and decision against God, but focuses on Jesus’ faithfulness.
According to 1 Timothy 2:4 it is God’s will that all people come to recognize the truth and are saved through it. If this is God’s will, why does it not happen? It is because God respects everybody’s free will. Why should there be a different standard for Christians? God shows no partiality.
My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand. (John 10:27–28)
This verse also speaks about God’s faithfulness. The expression “snatch them out of my hand” shows that Jesus speaks about external influences. He wants to give us eternal life but he will not keep us in his hand by force if we do not want to stay there.
In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory. (Ephesians 1:13–14)
And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption. (Ephesians 4:30)
As a strengthening of his readers, Paul often emphasized that God wants to save us. In these passages he also encouraged those who want to live as Christians, and we cannot expect that in all these passages he explains whether a person can fall away from God or not.
Actually, a seal can also be broken, but this cannot happen without consequences.
Some people argue that if Christians are God’s children, they have to remain his children forever, just like we always remain children of our earthly fathers. The expression to “be God’s child,” however, does not mean that every aspect of it can be referred to the relationship with God. For instance, nobody can choose to become the child of a human father, although this is the case with becoming a child of God. It is true, though, that even a person who falls away from Him will always remain His creation.
Common reasons for rejecting the teaching of apostasy
A lack of interest in others
We can only make others aware of the things that we ourselves are ready to live out. When newcomers join the faith, are they really given satisfactory and clear examples of what the full extent of discipleship means and what it looks like in everyday life?
Many neglect fellowship. Private matters are more important than spiritual ones, and the responsibility for others is shifted onto a narrow circle of leaders, if at all. As a result, many show very little self-assessment and recognition of sin, others are not challenged to give up sins, and still others fall back into past sins.
Understandably, under such conditions it is difficult and sometimes also “wrong” to see someone who lives in sin as having fallen away from God. There are also cases in which someone who went away turns back and starts anew. In this case the question arises as to whether such a person repented before at all. These and other cases often give rise to the wish that it is (should be) impossible to fall away from God.
It is wrong, though, to assess the situation in the New Testament through the perspective of this kind of experience and to arrive at the conclusion that ALL who turned away from faith were never Christians. The following passage is not the only one that clearly contradicts this idea:
For if, after they have escaped the defilements of the world through the knowledge of our Lord and Saviour Jesus Christ, they are again entangled in them and overcome, the last state has become worse for them than the first. For it would have been better for them never to have known the way of righteousness than after knowing it to turn back from the holy commandment delivered to them. What the true proverb says has happened to them: “The dog returns to its own vomit, and the sow, after washing herself, returns to wallow in the mire.” (2 Peter 2:20–22)
Giving up the fight against sin
If God does not have the highest priority in a person’s life, they will not have enough love to fight against sin with the determination Jesus taught either: “And if your eye causes you to stumble, gouge it out and throw it away” (Matthew 18:9). Because that consistency in fight is too much for them, the wish for the certainty that they can never abandon God is close to them.
The understanding of grace
God works in us “to will and to act” (Philippians 2:13) so no one can boast to him about what they have done. What is there that we could give, that we did not receive? Yet no one can grasp that grace fully unless they endeavour with all their strength to put their whole life at the disposal of the Creator.
Whoever thinks that God “without our own acting” does everything at the right time to grant us eternal life; whoever, consequently, builds up a comfortable life on this idea and considers those who strive to live up to the commandment of Christ as legalistic or self-righteous, such a person has not really understood what God’s grace means (see James 2:17, Titus 2:11–14).