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The Catholic church teaches you can kill yourself and go to heaven. This is a "damnable" heresy (as in 2 Peter 2:1 KJV). People who follow this lie and kill themselves will certainly end up in hell.
In the official Catechism of the Catholic Church (CCC) on page 550 the Catholic church teaches,
Grave psychological disturbances, anguish, or grave fear of hardship, suffering, or torture can diminish the responsibility of the one committing suicide.
We should not despair of the eternal salvation of persons who have taken their own lives. By ways known to him alone, God can provide the opportunity for salutary repentance. The Church prays for persons who have taken their own lives. (CCC, Libreria Editrice Vaticana, copyright 1994, Ignatius Press, San Francisco, CA, p. 550, #2282 & 2283)
What a great temptation and deception for someone in despair, to think they can kill themselves and still be forgiven before God! For a Catholic, being caught in a false religion and thus killing themselves in the midst of sin and falsehood, would certainly perish.
For a "believer" in God's Word, killing oneself goes directly against Matthew 24:13; John 15:1-6; Romans 11:22; 1 Corinthians 15:2; Colossians 1:23; Hebrews 3:6, 14; 12:25; and 1 John 5:4. Committing suicide is not enduring to the end (Matthew 24:13). It is not abiding in Christ (John 15:1-6). It is not continuing in His goodness (Romans 11:22). It is not holding fast the word (1 Corinthians 15:2). It is definitely being moved away from the hope of the gospel (Colossians 1:23). It is not holding fast the confidence and the rejoicing of the hope firm to the end (Hebrews 3:6). It is not holding the beginning of our confidence steadfast to the end (Hebrews 3:14). It is refusing and turning away from Him who speaks from heaven (Hebrews 12:25). And, it is not overcoming the world (1 John 5:4), but rather being overcome by the world and the devil (1 Peter 5:8; 1 John 5:18).