Actually, it is for exactly this reason that I think Forton is a brilliant character.
As someone with a rather colorful past (Oh could I ever share some tales...), I can completely appreciate the sentiment of the black sheep in the category. You're to say that all priests are purely holy and without something that taints their supposedly sacred vocation? Humans are human. They have flaws.
I am more-so interested in Forton now than before, actually. This little nugget of information leads to a more interesting an colorful persona that is definitely worth exploring (i.e. characters riddled with complexities versus simpler and of-fewer-dimensions characters that are knocked off from some overly used template)
Edit: "You're to say that all priests are purely holy and without something that taints their supposedly sacred vocation? Humans are human. They have flaws." -> 'you' pertaining to anyone, not OP.