Thinking through this issue, I did an online search and found this article.
I interact with it below, my thoughts in [this type.]
Question: "What is the Christian view of suicide? What does the Bible say about suicide?"
Answer: The Bible mentions six specific people who committed suicide: Abimelech (Judges 9:54), Saul (1 Samuel 31:4), Saul's armor-bearer (1 Samuel 31:4-6), Ahithophel (2 Samuel 17:23), Zimri (1 Kings 16:18), and Judas (Matthew 27:5). Five of them were wicked, sinful men (not enough is said regarding Saul's armor-bearer to make a judgment as to his character). Some consider Samson an instance of suicide (Judges 16:26-31), but Samson's goal was to kill the Philistines, not himself. The Bible views suicide as equal to murder, which is what it is—self-murder. God is the only one who is to decide when and how a person should die.
According to the Bible, suicide is not what determines whether a person gains entrance into heaven. If an unsaved person commits suicide, he has done nothing but “expedite” his journey to hell. However, that person who committed suicide will ultimately be in hell for rejecting salvation through Christ, not because he committed suicide. [These 3 previous sentences are really good.] What does the Bible say about a Christian who commits suicide? The Bible teaches that from the moment we truly believe in Christ, we are guaranteed eternal life (John 3:16). According to the Bible, Christians can know beyond any doubt that they possess eternal life (1 John 5:13). [Besides the dangerous but easy inference that you aren't a Christian unless you have no doubt, this is also bad exegesis: "we can know we have life" doesn't mean we will have no doubt about it, ever.] Nothing can separate a Christian from God’s love (Romans 8:38-39). If no “created thing” can separate a Christian from God’s love, and even a Christian who commits suicide is a “created thing,” then not even suicide can separate a Christian from God’s love. [Kind of a strange argument, but I think it works.] Jesus died for all of our sins, and if a true Christian, in a time of spiritual attack and weakness, commits suicide, that would still be a sin covered by the blood of Christ. [YES]
Suicide is still a serious sin against God. According to the Bible, suicide is murder[yes.] ; it is always wrong. [Not necessarily.] Serious doubts should be [I would say "can be" - there are times it is inappropriate] raised about the genuineness of faith of anyone who claimed to be a Christian yet committed suicide. There is no circumstance that can justify someone, especially a Christian, taking his/her own life. [I would not be so dogmatic. There might be a few extreme circumstances that justify it.] Christians are called to live their lives for God, and the decision on when to die is God’s and God’s alone. Although it is not describing suicide, 1 Corinthians 3:15 is probably a good description of what happens to a Christian who commits suicide: “He himself will be saved, but only as one escaping through the flames.”