I've always found
Erich von Daniken's books interesting in trying to find our religious link with that of our alien past. Much of it's bunkum but some of it is quite thought provoking.
I first read "Chariots of the Gods" when I was 13 in 1972. When I moved house 5 years ago I refound the original paperbook I bought in a shop (called OBM, I think) in Hobart, Tasmania. His theories haven't moved on much since then, but neither has relgion.