I know a teacher who said one of their colleagues adamantly believes the moon landing was faked.

>So if someone can please suggest what is the suggestion here? Keep working with public school? To be honest, the damage was done by their previous public school where the situation deteriorated to the point I had a fight with the principal, and their current school (since 1.5 years) is actually undoing part of the damage done there.

Look up school ratings in your area and move is by far your best bet if you wish to continue public school. There is also the difficult truth that maybe your kids are the problem, but again school shopping could help with that depending on what programs they have.