While I respect the opinions of others concerning this issue, I think everyone will agree that this issue is a serious one and one that requires deep study and understanding of scripture as a whole. Let's put popular theology aside, and really think about this for a moment. We owe it to those whose lives may hang in the balance.
The bible says that's it's impossible to please God without faith. Scripture also tells us that we are saved by grace through faith. While both grace and faith are gifts given freely by God, scripturally a person can both grow and lose faith. For a christian to commit suicide would mean that a person has lost all faith in God has decided to take matters into their own hands. Essentially they have elevated their circumstances to an "idol-like" status giving it power over God's ability to act on their behalf. In other words, their circumstances (most likely fuled by demonic influence) become their "God" thus not only would a christian who commits suicide be guilty of murder but idolatry also.
I wish this issue were as cut and dry as once saved always saved, it would definitely make matters so much easier however, the more familiar you are with scripture as a whole the more you will realize that there are far more implications that need to addressed.
Please don't think I'm trying to be self righteous with my answer, that is not intent at all. This is a very serious and real issue that I feel deserves a very serious and real answer.
Yes, I also beleive it is very demonical influenced, full of lies and deceitful. Very certainly, I don't beleive one should say that every suicidal person is having a mental illness etc... Most of them commit suicide because of having no more hope in their lives, nor having/feeling much love.
How can the love of God being "complete" in them if they feel like there is no more point in continue living their lives? Also "happiness" is something many of those suicide victims are longing for and wishing for, and having happiness is to be having love as well. You can't feel happy if you don't have nor feel any love. That way hopelessness digs more deep within you too, and then what more do you have or feel like living for if you have no more love and no more hope left in you?
It is a very sad and difficult topic to discuss whether they go to heaven or to hell. Still, I do think that it is not God's Will for any of us to be taking suicide. Life is a gift from God, and only He decides when He will give life and when He will take it away. No matter how hard and difficult our circumstances might be, He never gives any of us more than we can bear. Most of us can get through our own struggles with God's help, the same I think it also goes to those that takes suicide. They do have the strenght to get through, or else God would have taken them back to Him already. God has a great plan with every single person that He places on earth, but not everybody knows Him nor cares about Him, and still there are many that needs to get saved that are still being lost.
But for those of us that have recieved salvation, then if taking suicide like a Christian can justify our life with Him, thinking it is alright to end it, what example does we will give to other Christians with their own struggles too? Taking suicide is like saying that everyone struggling a lot should have the right to end it, because this is to much for us to bear. You rely most on your own decisions, and justify taking suicide with that you were given to much suffering on earth, to much that even God can't help you with. I think that is an ridicolous statement, because with God each one of us can make it. Even persecuted Christians in other parts of our world that goes through a lot of torture both physical and mentally but that still have survived and come through, because of their faith and commitment to God, whilst many Christians in the western world justifies suicide sin with that I can't take it anymore and God can't help me any farther, there is no more hope for me to survive through, but God will understand this?. Most persecuted Christians are more centered on God, whilst most western Christians are more centered on themselves. This is a true fact, and this is the way many of us here in the western world are like.
Of course life isn't always easy to live, and I do know how hard it can be struggling a lot mentally, I do that still, at times.... And the thought of taking suicide can at moments feel like very appealing to me, too. Still, this is most a very painful feeling, but never something I do. Because I want to become a Victorious Christian, and battle my way through with God by my side. I want to live out what plan God has for me, and do whatever calls God has given to me. I want to grow stronger through my experiences, both good and bad ones, so that I can also get more through with more life knowledge and with more of insight and wisdom from God. I do have my times of depression and when feeling all left by myself and alone, feeling that I am not much worth, and not worth to love. I do have my times when feeling like life isn't so interesting and not much worth living, and that it can be so boring and useless at times. We can feel so much pain and sadness inside of us, but at the same time long for continue living, but most to be living a life of happiness. I do truly Love to be living life, yesterday I did experience that wonderful feeling, feeling so alive, and so happy, and I just wanted to smile a lot, and laugh...
I beleive that we all do have a desire to live, and not to die. For most of us, death is a sad event. It might seem like a good way out, but I don't think that most people that are happy really gets this thought strucked to their mind.
"What profit has the worker from that in which he labors? I have seen the God-given task with which the sons of men are to be occupied. He has made everything beautiful in its time. Also He has put eternity in their hearts, except that no one can find out the work that God does from beginning to end. I know that nothing is better for them than to rejoice, and to do good in their lives, and also that every man should eat and drink and enjoy the good of all his labor—it is the gift of God. I know that whatever God does, It shall be forever." (Ecclesiastes 3, 9-14a)
