It is an interesting idea.
It was quite popular, I understand, for nobles to leave property to the church in their wills. But then such lands were not taxed, as they were church property.
Might be an interesting option if that was possible, and that lands given tot he churches couldn't be taken back by the lord, and they were subject to no taxes, or the greatly reduced taxes they get under the New Estates.
I wonder what kind of balance issues might crop up with this...
Indeed, unlike our temples, which now get taxed... Just to incite more people not to bother with them.