I understand monotheism as a huge movement to worship only one god, which seemed to originate several millenia ago in an effort to end polythiesm and pantheism. But pantheism went into royal families and what not as well...
It wasn't really that YHWH was the only God and all, he was jealous, qoute on quote, and wanted to be the only god worshipped, kind of like if Zeus wanted to be the only deity worshipped not Ares or Athena.
In particular I see the Norse/Germanic pantheon as should be "monotheist" in the sense Tor or Baldur, particularly Baldur, should be worshiped alone, not the other deities.
My UPG's are pretty crazy... I do not want to start an argument... I thought this was crazy... Like St.Michael was formerly an infamous Viking and also part of the Germanic royal family, which was also the Aesir, like Caesar, very close to Odin, or God, and also a Vanir, possibly Freyr, and later a Mercenary, ended up in the middle East.. So it's a lot of complete heresy, I and not ready to be ostracized or murdered.
But one God is jealous and wants to be worshipped alone by a relatively small body of people, and inconceivable amount of killing inseus, it's sickening... That YHWH or EL or whomever may be been a flesh and blood King or General, not some cosmic space wizard...
Back when royalty were Gods, not something they cover in most history lessons.
And the blue eyed blond haired "Viking" or "Nord" people are the Vanir, I guess. Not stereo-typing.