You: It is, as I am sure you know, possible for people to have conflicting faiths. For that reason, faith is not a good basis for defining anything, let alone good and evil, for anyone but yourself.

Aaron: I am not speaking of just any "faith," but of the one, true faith. True faith is not ambiguous at all to those who have it.

You: Well, I don't, so it's completely ambiguous to me. Perhaps, if you can demonstrate that your God exists, I can find a way to accept your faith.