Sci Fi novel with atheist/time travel themes main characters name starts with J, round buildings/windows???


New Member
Dec 4, 2020
Looking for the title/author of a book I read as a kid in the mid 1990’s. The copy I had was a paperback with a blue cover that I got from the public library. Possibly YA, novel about a man who ended up in another world (planet?) and had to adapt to a new way of life.
There were religious possibly atheist themes. Title may have had something to do with Light, main characters name maybe started with a J- Jeremy?
Buildings in the world were round, round windows?
Please help!

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