Most parochial schools I am aware of in this area do not require students to be or become members of that faith community. The only requirement is that if there are religious oriented classes ... and there are ... the non-member must be a part of those required classes. Often the non-member family pays a premium for sending their child to the school.

So, why do non-members send their children? Many times it's the real or perceived weakness of the public school district in their area; or particular problems with the faculty or staff of a particular public school their child would be required to attend.

I do agree that if you don't want your child exposed to the religious beliefs expressed at a school ... for heavens sake, your child shouldn't be sent there.