Affiliate Marketing Secrets

So, I have a 5 year old, so have been thinking about his education. My husband and I are trying to decide between private school or state (public) school.
I have two brothers ,and my husband has three sisters, and all of our nieces and nephews are school-age. While we love them all the same and think they are all great kids, there is no question that the ones that attend private school are more well-rounded ( proficient in French, Latin, an instrument, and several sports) and seem more mature. I don’t think that they are any smarter or have better parents than the other kids, so the schooling must be what sets them apart. The only thing stopping us is the cost (astronomical!). Another problem is that ALL the good private schools we have found are religiously affiliated, and as my husband and I are atheists and do not promote belief in god, I don’t know if this would be confusing for him. If it is hardly mentioned, that’s fine, I just do not know how heavy-handed they are at those places. Opinions?