In case I never answered your question simply and distinctly, the answer is no. In fact, not only is it never taught, it is actively taught against.
God spends 2/3 of His word and 2/3 of History explicitly and repeatedly reinforcing the nation-defining Jewish theology of God's singularity.
Throughout OT Scripture, he is purposely forcing and reinforcing the paradigm, setting the stage for when Jesus would come. He essentially says, in his word, here is my (personal) DNA, and if you find anyone with this DNA you have found me, because there is no one else with it.
True Hebrew scholars never looked at the words of the Hebrew Scriptures, and saw anything other than God being one person. Modern Hebrew scholars cannot match the understanding of that language, because they are looking back on it 2000 years later. The ones that truly understand a language are those that understand all of its cultural implications, nuances, etc. - those that have been bathed in the language from birth.
If God knew his people misunderstood what "one God" meant, and that the misunderstanding was defining them as a nation, there is no way that he would have sent Isaiah to push them deeper into heresy with all his talk of one God (by the way Heb 1:1-2 says that was the Father speaking through Isaiah, saying there is no one like me, With me, and I made the heavens and earth by myself without any help). It is just not his M.O. to purposely mislead people and set them up for believing a damnable heresy.
The child that was born and given was the Everlasting Father. God and man.
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