The issue for the christofascists isn’t that children are being indoctrinated in school. The issue is the deprogramming of the indoctrination to fear, hate, intolerance, and self-loathing that they get at home from their parents and at church from christofascist leaders.
Schools don’t make people more liberal, exposure to reality makes people more liberal.
If they actually cared about child indoctrination, they’d be fighting to make churches 18+.