Let's face it, Athelstan is a nice guy. Ansgar is a tactless douche. You don't go into someone's village and start yelling about how all their gods are wrong. You knock on a few doors and say, hey, got some time to talk about Jesus? That to me is more Athelstan's style, heh.

And yes, Floki at the end. That is the culmination of everything he's dreaded since Ragnar took Athelstan in.