God did not write it. I think we established that.
God wrote it by establishing in the hearts and minds of the people who did the penning, the literal things He wanted written.
You do realize that by that idea anything could be possible just because.
There even is a Bible passage that says that with God all things are possible.
All things are also possible for Odin.
"Odin" is a name. That's the only reason we capitalize the thing. He certainly wasn't god, if he even existed at all.
Next you're going to say that Valhalla isn't real either.