There has actually been a lot of debate about where the destination of a Christian that commits suicide is -heaven or hell? This was not actually particularly addressed in the Bible, but it is a happening that happens up till this present moment. However, it is not proper for a Christian to commit suicide under any condition. A Christian is a faith person, so he or she should still hold on to his or her faith no matter the condition. But if a Christian commits suicide, many believe that such Christian is going to hell. Well, they do not really have a solid bible passage to back this up directly.
Also, some preachers have made it known that though a Christian might have committed a sin by killing him or herself, that does not make him or her go to hell. This is simply because he or she is saved and has been bought by the blood of Jesus Christ m, which he shed for all men once and for all, according to the book of Hebrew 10.
When someone commits suicide, Christians believe that they automatically go to hell. There is no salvation. Christians do believe in salvation for many of the sins committed by Christians, but suicide is different. There is not salvation for suicide. When someone commits suicide, they kill themselves. Christians refer to their holy book known as the Bible to explain why and that it supports their belief that people go to hell for committing suicide.
However, there are some Christians who do not strictly believe this belief. If someone has mental issues, they may not go to hell if they commit suicide because their mind was having issues. There are Christians who commit suicide and they do know and possibly believe that they will go to hell.