Ive only read 1 SciFa series and i loved it. But it was subtle, tho.
It was the Samaria chronicles by Sharon shin
On the surface, its about angels. Or, a world governed by angels who do everything in accordsance to "God".
But the more you read, the more you learn just how much AI has influenced the world and their concept of "God".
One big thing through out the books were that there is a race of people that is heavily "jewish coded". The rest of society doesnt like them because "god has ignored them". They are persecuted and enslaved and killed.
BUT.... they are the only people with out "Gods Kiss" which is a jewel implanted at birth on their arm. So "God" doesnt "talk" to them and doesnt "see" them.
You find out what that all means in the last book where an anti-angel woman digs out the "Kiss" and joins a group of rebels who dug out their "kiss".
(Edit to add: there is also a race of people who are muslim coded... the women wear veils, men and women are segregated, they are strict in their prayers and their devotions to "God"... but they dont trust the Angels, and they are the main slave dealers)
All this takes place on another world because the lore is, their world was dying, so "god carried them to safty in his cupped hands" and sent angels to watch over them.
I discovered it in middle school, rummaging through a paperback book sale. The book was way to mature for me to understand at that age, but i kept it and reread it in HS, discovered it was book 5 in the series, and bought the other books.