We're bouncing back and forth between the comics and the TV/Movie universes,discussing characters who have yet to appear in the MCU and sharing when we first met certain characters.He is a God. His strength comes from magic. The mythological world is rampant with demigods who's mothers managed to have sex with gods and not die.
One more time: That's the comics. It's not the case in the movie/TV universe that we're discussing. The MCU Thor is an alien, not a god. Odin explicitly said in The Dark World that Asgardians are not gods.
Any how, the point still remains. The "mythological" world is rampant with "demigods" who's mothers managed to have sex with [Aliens who have been mistaken for ] gods and not die.