It doesn't that much, when it comes to God, in some religions you're very unlikely to suffer after CTB (For example, when you're catholic you might be not sure if you will have to spend most of your life in hell or not, but afaik, due to the nature of suicide [mental illness], you will not suffer because of that. Assuming that the catholics' afterlife exists, you will be judged by other stuff, not for the fact you decided to end your life while it was unbearable). I'm not a very religious person, and well... no knowledge about what will happen with us after our death may be a bit scary... but also it's quite intriguing. If I decide to not CTB, religion or any other stuff like that won't be the case I think.
I don't want to make any assumptions about afterlife, reincarnation etc. If it exists (or not), we will check it out sooner or later. Everyone will die one day, no matter if due to CTB or not. That makes my fear about it almost non existing.
If it turns out to be even worse than being alive, well, I gambled. Everyone gambles when dying I think. If it's better, worse, or if there's nothing waiting for us and we simply disappear... I don't mind that much. I will suffer, rest, be non existent anyway soon, maybe a bit earlier than others at my age, but it doesn't really matter for me. Discussions about it are really interesting, but I don't want my decision to be under influence of something that's not certain. The only thing I'm sure about is that's the time for my departure from this world.