I think that if the various religions of the world want to teach their belief in our schools, they need to pay for it like Coke and Pepsi did as they invested in American obesity in the '90s. Let these religious outfits pay the schools to teach this stuff, and reduce the taxes for the rest of us
We could have it set up like the radio dial, where the stations on the very left of the dial are publicly funded and everything else could be purchased. The classes in the morning could be the "core curriculum" and classes after lunch (nap time?) could be paid announcements. Of course parents could opt their children out of the paid part, to let their children attend classes that would prepare them for the real world.
Interested religions could finance this with their prolific televangelist fund-raisers.
Jemez Springs, NM