The Rambam wrote the sefer Morah Nevochim, to answer the questions one can have regarding emuna. Most ppl aren’t allowed to read it. Why?! That’s “kfira pure and simple”, isn’t it? It’s not meant for everyone. Besides, was there anything wrong with the kids who believed in the alteh heim with temimus?
BTW, I totally lost you on your second reason why I wouldn’t enlighten the temimusdike kids. Why on earth would you think that?