Annihilationism is the belief that the unsaved will be annihilated either immediately after death or after experiencing a temporary time of punishment. They will not face eternal separation from God.
This belief is immediately called into question on the basis of Jesus’ own teachings. Jesus taught that the unsaved “will go away to eternal punishment, but the righteous to eternal life” (Mat. 25:46). In other places Jesus reaffirms the external nature of hell (Mark 9:43, Mat. 18:8), Revelation, which is alleged to be Jesus’ revelatory words, also tells us that “They will be tormented day and night for ever and ever” (20:10). Eternal punishments is likewise affirmed in Revelation 14:9-11. On the other hand Jesus affirms the eternality of life with God in heaven (John 3:16-17); something reaffirmed elsewhere in the New Testament (2 Tim 1:10).
So, why doesn’t God just annihilate the wicked instead of punishing them forever?
Firstly, if God annihilated wicked people then it negates different degrees of punishment (something affirmed by Jesus in Matthew 10:15). Would the mass-murderer Hitler deserve the same or more punishment as the unrepentant man who extorted money from those in his business? It would also strike me as unfair, for example, Hitler would get away scot-free; he would face absolutely no consequences for his bloody, ruthless actions. Also, why would God annihilate people made in his image; would that not be an attack on God himself? Rather, hell is eternal separation from God & a place where God allows them to continue in their rebellion. Hell is a place where God quarantines the wicked, it’s also worth noting that those in hell will probably continue to curse God. After all, why would they have a change of mind in hell? They are there because they have rejected God andd his revelation in the world & through Jesus.
On the basis of scripture annihilationism is rendered false. Likewise Jesus clearly taught the opposite; namely that eternal separation from God will be experienced by those who reject him.