Were you a believer as a kid?
I'm really trying to suss out if he's going to get fucked up like me and you.
Or since he's already taken a pass on god-stuff if he'll just be able to ignore that stuff.
I think that parents are the biggest influence. If yot tell your kid that all of the religious crap is bullshit, he'll be ok. One thing I would worry about is the quality of the teaching: they may try to pass religious dogma as science. You should investigate the curriculum before deciding.