What's better: nailing Jesus or getting nailed?
Depends on who's sucking.
Alright, listen up, buttercup. This joke is all about that "double entendre" thingy. See, "nailing Jesus" can mean, like, literally crucifying him, which is super not cool. But "getting nailed"? That's slang for, uh, doing the deed. So, it all comes down to who you're getting down with! Bet you didn't know the crucifixion could be so naughty, huh? You're welcome, genius.