1. Seems like a ritual, ritual cleansing and bonding.
2. This is the beginning of the "Raiding Age".
3. He raped the slave of Floki, not the daughter of the blacksmith.
4. Oh yes, the friendly, glorious and honorable vikings, that's how we remember them, not as a raiding horde that raped, killed, pillaged and burned, not necessarily in that order.
5. A seer. IIRC there weren't that many priests. For most religion was a private matter.
But please, don't stop your rant, it's amusing actually.
That said, it seems to me that the Jarl isn't accurate.