I'm not sure if this is exactly what you're looking for, but you could add this to the Fraticelli religion entry:
Code:character_modifier = { temple_tax_modifier = -1 }
That sets the temple tax modifier to -100% for all Fraticelli characters.
This will work. Thank you.
Simply make all temple_tax laws other than no taxes (temple_tax_0) unavailable to Fraticelli characters.
And this will also work. Thank you.