actually... you can have 2 things
a tithe set by banker.
a tithe set by lord.
all out of existing pot.
and no. some religion boss shouldn't be allowed to levy anything themselves. they can exert power to force a levy via another character (riots that loots gold, for example)... but not directly.
and it should be possible for paganistic nobles/gov to get rid of followers of player religion via persecution. afterall, what is paganism in this context? they believe in something, just not the something the player created religions believe in. romans with their many gods are seen as pagans by christians, for example.
