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.
I dropped Christianity as soon as I got old enough to read other books that weren’t the Bible, and I realized that most of what was fed to me was easily proven to be false. In a sense, educating myself did indeed cause me to lose my faith, and I’m grateful for it everyday.
That’s why they hate public education and why they have been trying to destroy the education system for years. As long as there is public education there are people who will see through their christofascist nonsense and fight them.