Your best defense, if you insist on public education, is this:
1. get to know the teacher very, very well, and spend some time every day in the classroom
2. read every book/textbook the school requires your child to read BEFORE they have to read it, and insist on previewing any videos they might want to show in the classroom or in school assemblies
3. talk to your child every day IN DEPTH about things they are taught in the classroom.
Remember, the price of freedom is ETERNAL VIGILANCE.
If you don’t have the time to do all 3 of the above, you are screwed.
You also have to read all of the teachers’ manuals and materials from the in-service day trainings. Most of the worst materials are in those sources. They are importqnt because they determine what the teachers actually say and how the teachers conduct classes.
Maybe you could be a full-time teachers aide in your child’s classroom. That is about the only way to know what is really being done.