Idols are vessels for demonic worship.
You know nothing about this subject and are showing it.
kachina dolls are not idols
Seriously my brutha, who TF called in the Hopi Nation PR firm and the Ultimate Northern Hemisphere Gang of the Enlightened and Open-Minded Pantywaists to make fine distinctions about what "idols" are. This is pagan spirit junk, which is exactly how they have been presented to the children.
Some Christians forbid the ceremonies but others see it as merely a remembrance of one's history.
Similar controversies occur in Asian ceremonies to commemorate ancestors, called ancestor worship by some and forbidden,but given a Christian interpretation and allowed by other Christian leaders.
However, it seems like the teacher was pushing the new age interpretation rather than explaining Pueblo culture to the kids.