As long as it's not an actual shrine. These things cost a fortune, so easy to send a religion bankrupt if everyone can start spamming them.
That would only be a problem if they could build unlimited shrines, if it's one each it should be fine. Church of Aaron has twelve shrines right now. Each coasts 1 gold apiece on tax day. There are a total of eleven nobles in the religion. I checked SA as well. I lost count of the shrines but there's close to a hundred. Looks like they cost two gold max. SA has only 35 full members. So one shrine per knight should be sustainable.
