I don't know how it works where you live, but here it is very simple, most public kindergartens and even private ones don't teach religion, and if they do, you need to sign up a separate paper saying 'I agree that religion X is taught to my kids'. If not, I'd just walk on the kindergarten and say 'How about no!?'
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you