Teachers will keep in confidence something you've shared with them privately, just make sure you've also talked to the principal and they know you have done that. Breaking confidence is a big no-no.
Just explain yourself to them and they'll back you up in your decision to "normalize" your children's experience. If you have this talk with them you may just be able to open their eyes to the harmful effects of the wt cult.
But definitely talk to the principal first and let them know that any concerns you share with them about your situation are to be considered confidential.