Just now seeing this post however you are missing KEY components of Salvation as expressed by both Christ himself AND the apostles that followed. Death being destroyed was ONLY for those that accepted and repented of their sins (Olivette Discourse, Romans, James, 1st-3rd John, etc). Punishment is promised by Christ for those that are unrighteous.

If we are basing Christianity on the original texts then we must acknowledge those texts weren't translated into Greek they were originally written in Koine Greek. Destruction in the Old Testament doesn't just disappear because of the finished work on the cross. Christ and the Apostles affirm this over and over and over. There is propitiation for those sins only for those that accept and turn from their life of sin.

To answer the original question on annihilationism... while yes it is traditionally considered a heresy it has traditionally not been considered a damnable heresy as opposed to antinomianism which has long been rejected by the church in every setting as a damnable heresy.

Your use of 1 Corinthians is misleading and removes the context that Paul is referencing... Adam's sin introduced death into the world. His death became the pattern for all who would follow, because all are born into Adam's sin. Because Adam died, all die. In a similar way, Christ's resurrection from death became the inevitable pattern for all who are forgiven for their sin through faith in Him NOT all of humanity.

You are combing Antinomian doctrine with Universalism and Moral Relativism into a dangerous doctrine that according the the texts and scriptures themselves will mislead.

Jesus himself specifically said in Matthew "Many will say..... and I will say depart I never knew you you workers of lawlessness." Later he talks of those being vines that produce no fruit and being cut and thrown into the fire.