[Polar]

My 2 cents

Having read both visas I would agree with sarasi.

The religion one is meant for "importing" religion into Japan so to speak i.e. you're Mother Teresa and you want to open a convent.

The cultural one makes the most sense with the head of the temple sponsoring you. This is something one can only partake of in Japan etc...

At any point it's a visa that I suspect is not an easy one to get.

But I know zero about this, just guessing based on the wording.