The only thing is how do explain the speech and saying he's a god? Or does he just talk funny and call everyone mortals because he can see them dying.
The premise there is that he and the other Asgardians have come to Earth before. They interacted with the people of Scandanavia centeruries ago. The Asgardians accordingly adapted Earth based languages, and really have no qualms about the worshipping and being referenced as gods. They did depart when conflicts were waged in there name... There can be a line that Thor is being sent back to
Midgard to learn humility, and shall live without his Asgardian might, etc...