Manifestation of plural gods = 1 used by Christianity is a recipe that is similarly used by Hinduism. To solidify such claim is really easy, simply by saying God is omnipotence thus He can do anything.
And making such claim, any concept of religion can be invented as God can do anything.
For e.g. The black space of universe is God. For a portion of God's mercy manifested and form the universe. Evidence: NASA says universe will always expand eternally, and forever. As such one shall worship the black space of universe for the universe is an everlasting God being equal and a partner to the Almighty God.
As for covenant of Noah, Abraham, Israelite, Muslims. Its is all about a unique and singular God, no lesser deities, partners, equals, manifestations etc.
