Let the parents of school age children in the USA speak. First hand current experience can answer our questions some.
1) Do your kids go to:
a) regular public school?
b) public charter school, what type?
c) private, parochial, or faith based school?
d) home school?
2) What type experience do your kids mostly generally have? Can select more than one.
a) learn the basics including the 3Rs.
b) religious.
c) Marxist or secular humanism indoctrination.
d) none with bad crime or poor building repair environment.
3) Is your local school board left liberal or right conservative?
4) Is your school district mostly urban city, suburban, or rural?
For whatever anecdotes are worth, here's my experience. My children are now in their 20s, but their K-12 experience was pretty recent.
1. My children attended a regular public school.
2a. My children learned the 3Rs, and much more than the 3Rs, including science, advanced mathematics, history, literature, music, and drama. The school offers a healthy selection of AP courses.
2b. My children learned a bit about various world religions in school, but most of their religious education happened at home and at church.
2c. I assume they learned about Marx in their world history classes. No bad indoctrination that I could see. From their family and their church, they were taught about the importance of caring for the poor. (That might be literal "indoctrination", the teaching of Christian doctrine.)
2d. The building needed repairs, but the teachers did an excellent job. I watched dedicated educators do amazing things with a minimum of funding.
3. We've been spared the left-vs-right stuff in our school board. They're mostly focused on providing good educational opportunities for the students. (I'll note that most of our community is supportive of LGBTQ students. There's a GSA at the school, and that's not considered controversial. That might be "liberal" from your point of view. Our school reflects our community.)
4. We are a small town of 23,000, about half an hour from a large city (Philadelphia).