My knowledge of other religions is limited, but it seems to me that all of them offer some kind of hope in that regard. So if the possibilities range from a neutral outcome to desirable ones, what's there to fear? Not trying to be glib here, I'd really like to understand.
Suppose you belong to a religion that espouses reincarnation. Let's further suppose by your own calculation you merit spending the next several thousand years as lifeforms with much crappier lives than your current one. That seems like a good enough reason to fear death. Or is that not what you are getting at?