I didn’t know Asimov was a theist. Glad to hear it.
I was a great fan of the Foundation series years ago. I still am fond of his future historian idea.
All science fiction writers are future historians.
Possible exception of Harry Turtledove.
When you have 15 - 20 minutes or so to kill, I think you will really like this one:
http://www.multivax.com/last_question.html
A classic short story.