Religious school/college/etc.

So, there are some schools in the world that are affiliated with certain religion, like they have a church in their campus or have course about bible, according to the wiki page about school they should be tagged with the religious=* tag.
Then, how about schools that are for religious purposes? As in, unlike the previously mentioned cases which are regular schools that have some religious element in their program, there are also some schools that exists for the sole purpose of transmitting religious knowledge. How to tag them?