New York has eliminated religious exemptions by law. Florida is a religious-exemption state, as well as a medical-exemption state. and Flagler County in 2017 had the second-highest proportion of kindergarten students in the state with an exemption, most of them for religious reasons.
Imagine if, during the Jim Crow era, a newspaper offered advertisers the option of placing ads only in copies that went to white readers. That’s basically what Facebook is doing nowadays.