(I have not read the whole thread and I do not know whether someone has already written the following perspective or not.)
So, actually if you delve deep into the upanishads, you will see that Hinduism is not classical Monotheism at all. I reproduce below the description of the Self (which has three manifest states: waking, dream, and sleep) and a transcendental Fourth called Turiya where the consciousness is alive and there is no subject-object division. The fourth state of Self is not different from Brahman, and it is represented by the sacred syllable AUM or OM. The experience of this Fourth state is considered to be an ultimate blissful experience. It is said that the world functions based on a fraction of this bliss.
Mandukya Upanishad
The fourth condition of the Self corresponds to Ôm as One, indivisible Word. He is whole; beyond bargain. The world disappears in Him. He is the good; the one without a second. Thus Ôm is nothing but Self. He who understands, with the help of his personal Self, merges himself into the impersonal Self; He who understands.
Some people may not use 'He' or Him' for the Self, since it is not a person, in conventional sense. Yet, in Hindu literature, it is called
Purusha, which is translatable as 'Male Person'. But
'purusha' actually means
'Purva' -'Usha' (before light). So,
Purusha is the person before the light, which is daughter of the
Purusha.
Since Purusha, Brahman, Self is one without a second, Monotheism is not the fundamental reality, as per Vedanta.
...
(Again, this is approximately from the perspective of Advaita Vedanta.)