I'm no expert on ancient Hebrew, but I noticed that there's a difference between god as "a divine being", and God as in supreme being. In many of the passages you cite, it can easily be interpreted that there is only one true god of the Jews. Your Malachi verse, for example-- it clearly refers to the Semetic god YHVH, and does not exclude any of the others, since it refers to the god who created them. That does not mean that another god did not create the other people in the world. (And in fact, Genesis references some such people, such as the inhabitants of the land of Nod.)
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However, if we're speaking of the message of the OT, then I don't believe it can be any clearer - YHVH is God and God alone, despite whate else people might be saying or doing.
When it comes to the message of the old testament, it says that there is one true god for the *Jews*: YHVH. Not that YHVH is the only real divine being, just that he is the one for the Semitic tribes, and he will tolerate worship of no other.
The concept that there is only one god, period, I'm not sure where it originated. Sometime after the time of Paul; he referenced other gods, although I can't recall him outright denouncing any as false. At any event, the point was that I'm not sure when omnipotence or singularity was bestowed on YHVH. It wasn't in the old testament, though.