I had this when we enrolled DD1 in a catholic school back at home. I felt that it was better for her to be in a school where spirituality is an aspect of school life (even if my own beliefs don't mesh 100% with what they teach). We would always discuss the things she was learning and at times that meant I was able to say "the catholics believe.... and that's similar/different to what I believe in that....". It wasn't ever an issue. There's a kernal of common spirituality in all the world's religions and that's what I focussed on.

HTH