Its not fear of death per say, its more fear of the unknown. In all the time mankind has been around, with all the technological advances, we still dont have a clue about what it means to die. Lots of accounts of peoples experiences, but nothing definitive. That is the real fear.
My own experience is that death is just the beginning of something much bigger that right now, we cannot possibly understand. But it is certainly nothing to fear and maybe because it is not so unknown to me, its why I dont fear death at all, I will embrace it.
But if you are pumped all your life that suicide is going to mean you spend eternity in hell, or that you will return to this earth because you left too soon, or anything and everything that is negative about death, you are going to believe some of it, or it is at the very least, going to create some severe doubts and fears. Very clever psychology by the creators of such crap.