Advocacy of a specific religion should not be part of a citizen's formal education. Private religious schools receive public funding and public accreditation, and they should not, nor should any other private school, for that matter.
The above commenter immediately claimed that private religious schools are "indoctrination" - despite the previous comment only mentioning religious schools in passing (since they're generally less expensive than secular religious schools). That kind of intense blanket leap to a serious allegation is not indicative of reasonable view on the subject, regardless of one's opinions on public funds going towards religious schools.