A Christian can have thoughts of suicide. At my Cru group we talked with two people in the group. Saying that if one commits suicide they will be going to hell, while it maybe true, is not really loving. I had suicide thoughts, they weren't like the ones I hear about. I had a rough day or something, I don't quite remember and just wanted God to take me away from the earth and to heaven. I really have not had that kind of day before but that was rough. But the assumption that if one commits suicide the suffering will go away is not true because then the family will have to come to terms with it, many will blame themselves for not being able to stop it, etc. But the Bible does not really condone suicide, Judas hanged himself, Ahithophel hanged himself, and there might be other instances of suicide in the Bible that I can't think of. But it is a form of murder, but it is true that God will have compassion on who he will have compassion and mercy on whom he will have mercy. As one person mentioned Jonah wanted to die, Elijah one time wanted to die, and maybe there were more. When it came to Elijah, God reasoned with him and I believe Jonah as well. But we as Christians need to love those who have these thoughts, pray, etc and when possible dissuade gently, kindly, etc not with anger or with words that backfire and make the person want to kill themselves.