In pre-writing for my fantasy novel this summer, the hardest thing for me to do is establish the religion of Northern Aldridge. I've laid out the two options before, but here they are again.
Option 1 - The White Wings bring hundreds of Wingless infants to the north, and raise them to believe they are deities, and to worship the White Wings as gods.
Option 2 - The White Wings have their own God, and force the Wingless to worship it. Over time, some become fervent believers, and want to so all they can to help, so the White Wings allow them to go north.
Yet both have their flaws, such as option 1 everyone would be the same age at the start, and option 2 is... well... boring? It also leads to the possibility of an insurrection since north of the wall they have magic and hence the Wingless are stronger than the White Wings.
So, I set up a poll for your preference on either option, or if you have an idea of your own.