Lauren that's a very good point. There's different kinds of sin, willful disobedience, and sins in weakness. I think God will judge the heart of any suiciding christian. I guess all suicide falls under the sin in weakness category, who in their right mind would want to willfully kill themself?
However, that said, suicide has traditionally been regarded as a mortal sin I think , Catholics?. There are early church writings (non-canonical of course), which prescribe suiciders being in hell punished for their sin.
The only example in the bible of a former christian committing suicide going to hell is Judas Iscariot. But he went there not because of suicide but because he was the son of perdition. If letting christians know that suicide may result in them going to hell, prevents them somehow from doing it, then I guess it's a positive thing to believe in.
Scripture also says, no murderer has eternal life abiding in them, and that's even just talking about hate not the actual act:
1Jn 3:15 Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
Maybe then suicide shows they didn't have eternal life and weren't truly saved in the first place? That makes more sense to me I guess. A person who knows God loves God and loves their own life and body. They usually have a sound mind and want to please God in everything. Something to think about.