It is not obvious to me that option 2 (make up your own religion) and option 4 (make it part of the background worldbuilding) are incompatible. I'd say Turner did both in her Thief books.
I'll try to think of some "religion as background" books - I know I've read some, but I can't just now think what they were.
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Date: 2010-08-15 01:36 am (UTC)I'll try to think of some "religion as background" books - I know I've read some, but I can't just now think what they were.