Some Christians understand the plural character of the name “Elohim” as referring to the multiplicity of persons, Father, Son, and Holy Spirit which we know all to be God.
Personally, while I like the Trinity doctrine that Father, Son, and Holy Spirit are 3 distinct persons but only one God, I have never bought into a common understanding that equates God with these 3 persons as if the Christian knowledge of God must encompass His totality. I believe in an infinite God not a God who is only 3. These 3 are simply the persons of God we have encountered and neither God nor the universe He created revolve around Christians and their religion.
To be sure, the Muslims do not like this doctrine of the Trinity, for to them it sounds polytheistic, which they see as anathema worthy of condemnation. This is understandable because the Trinity sounds polytheistic to many non-Christians. But in the same way non-Hindus make the mistake of thinking that Hindus must all be polytheistic, when in reality most are monotheistic in the same way as Christians, believing God to be more than one person but only one God.
For this reason, the ideas of authors like these, seeing elements of polytheism in roots of the Bible does not bother me in the slightest. I will obviously insist that it is still one God no matter how many persons God may be.