"A of all," says Magnus, "You know that arrows guy^* in all those paintings? I'm pretty sure catholics are horny about saints and stuff all the time. And Jesus, too; I'm pretty sure there's a ton of horny Jesus art out there. There's like songs about him being sexy or something⁺. And movies about how he fucked^$? So even if Percival was Jesus Christ, it would be fine to, like, be in love with him and think he's hot. B of all, you could never sully anyone, ever, because you're not, like, morally or literally dirty or diseased or anything. C of all, I might not be, like, well-versed in your religion beyond what you've specifically told me, but wouldn't Jesus, like, be down with love? Especially loving someone important to you?"

*Do I even need to clarify that he's thinking of Saint Sebastian?
⁺Nice job finally working in a Hamlet 2 reference, S
^$He's thinking of the Da Vinci Code...