For a long time I've been pretty worried about my mortality. But ever since I became a Christian a couple years ago, I've been much more at peace about it. Not all the way (yet?), but much more than before. I highly recommend looking into Christianity to anyone else feeling that same fear.
I have gone the exact opposite path, from a life pretty entrenched in Christianity, to skepticism, to a conclusion that led me towards hard atheism. I feel like I am sure there is no supernatural creator, and the only love we receive is from people. I now thank people for their good, not God, and get angry at them for their bad, not at Satan. Religion starts off by lifting your responsibilities, and that is the worst…
But very few people have gone from atheist to Nicene-creed-believing Christian in their adult life, which I did. This seems so backwards, don't you just wonder what their reasoning was? I do.