Agreed.
I homeschool my 6th grader, but my 9th grader goes to a private (Baptist) high school. He gets plenty of liberal indoctrination there, by both his Bible and History teachers.
It was the same back in the seventies. The kids would go to the local Episcopal school, get fed full of crap, and then have to endure my de-programming at night. I used to spend as much time on emptying their heads of nonsense as I did helping them with their homework.
However, after a while, they started seeing for themselves what dribble they were being fed and could reason their own way around the teacher’s indoctrination.
It got so bad that the parents staged a coup in the summer of ‘78, fired the headmaster along with over half of the teachers, and hired replacements.
Things smoothed out after that.
Why pay for that? There are online courses that are far less expensive. Overall, there is an unbelievable amount of low cost and free educational material out there for high school aged children.
No doubt about it that “christian”, with a small “c”, churches are becoming more and more liberal.