As for not being afraid of hell....
I guess that makes sense that the only people afraid of it are those who believe in it. I mean, if you believe there is no soul/heaven/hell/afterlife, then the fear of being punished for making the wrong choices wouldn't be very scary.
I am not a Christian out of fear of hell, but out of love for God. What would scare me though is the "what if" factor, you know? I mean, I could easily see where the concept of eternal punishment and torment in fire doesn't exactly fit into human scientific logic. But to stop and think of the "what if", seems pretty damned scary.
I mean, matters of faith & spirituality cannot be proven, that's what makes it faith. However, it can also not be disproven, either. So, either way, it is all about faith - faith that there is something, or faith that there isn't. The only way to find out for absolute sure is to get there.