specifically the belief that there is this 'unforgivable sin' which can cause God to completely turn his back on you forever.
flower, I guess this never bothered me. I had already been disfellowshipped, so I was on Jehovah's $#!+ list as it was. That and the fact that JWs teach that once you're dead, you're dead, so what was there to fear, but release from Life's hardships? Suicide was a viable option to me. If it was the unforgive-able sin, then what was there to lose if I was already DFed?
I have a lot of sympathy for anyone who commits suicide. It is done out of desperation or lack of where-with-all in how to handle whatever is ailing them. But I also realize today, that suicide is a very permanent answer to a very temporary problem - whatever those problems might be. I really don't ever see myself getting so depressed that I would attempt again. I have tools and a mind-set now that I didn't have even just a few years ago.