I hope this doesn't come across as rude as it's not meant to be, but are you from the UK? The reason I ask is because my experience is that it's more unusual to be religious than not. I've lived in ED all my life and throughout my school life those with an obvious religious affiliation (ie actually living by religious beliefs/attending a place of worship regularly) were in the definite minority rather than the majority, so except for the choice of school issue I wouldn't have thought any of the other things you raise would be a problem at all.