[Ali Imran]

In Christianity, apostasy happens when a Christian renounces his faith in Jesus; or when he abandons Christianity to join another religion. There is no such thing as punishment for apostasy in Christianity. The unbeliever is free to accept Christ to join Christianity. And having become a Christian, he can choose to abandon the faith any time he deems convenient. And No one has the right to punish him for such a decision. This is because Jesus forbade us to punish those who have committed apostasy on Him.

Jesus said, “He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still (Revelation 22:11).” This teaching of Jesus Christ restrains both the clergy and the laity, the family, and the community from persecuting, punishing, or causing someone to suffer pain for abandoning Christianity. Leave the apostate to God; He shall deal with him. Hence, there is no punishment for apostasy in Christianity.

If your brother, the son of your mother, your son or your daughter, the wife [c]of your bosom, or your friend who is as your own soul, secretly entices you, saying, ‘Let us go and serve other gods,’ which you have not known, neither you nor your fathers, 7 of the gods of the people which are all around you, near to you or far off from you, from one end of the earth to the other end of the earth, 8 you shall not [d]consent to him or listen to him, nor shall your eye pity him, nor shall you spare him or conceal him; 9 but you shall surely kill him; your hand shall be first against him to put him to death, and afterward the hand of all the people. 10 And you shall stone him with stones until he dies, because he sought to entice you away from the Lord your God, who brought you out of the land of Egypt, from the house of bondage. 11 So all Israel shall hear and fear, and not again do such wickedness as this among you. - Deut 13