Thank you for your kindness but you are taken our texts are out of context and others are from bad translations.
No,his argumentis correct,but he has used extracts which used several times to reconcile Hinduism and Islam.Monotheism is an important philosophy in Hinduism.It is called Dvaita started by Madhavacharya.
Vedic texts can be intrepreted ( the shrutis Upanishad,Brahmasutra,Bhagavat Gita)in any of the three ways(or u can invent some ways) Dvaita....Vishishtadvaita(qualified nonduality Ramanajuacharya).....advaita(from sankara---complete monism).Advaita is the most abstract concept that symbolises divine union and it takes up absolute unchanging standpoint.Buddhist Sunyata is the exact conceptual opposite to advaita.They are non-contradictory perspectives of truth.
To emphasize monotheism is common Islamic perspective ,in fact it was used by MAdhva to save himself from Mughal Islamic conquests.It is called Tawheed in Islam. Islamic Monism has roots in sufism,
"There is no God but allah"----------->Monotheism(duality)
there are few Sufi interpretations like this
"there is nothing but allah"----------->Monism(non-Duality)
"There is nothing in wujud [existence] except God...Wujud [Existence] only belongs to the Real One". The fruit of spiritual ascent of the Sufi is to "witness that there is no existence in the world save God and that 'All things are perishing except his face' (Qur'an 28:88)(from wiki)
These concepts have presence in the words of Christ.
I am the Messenger of God--------------duality
I am the Son of God------------Qualified Non duality.
I and my Father are one----------Non-duality.
Then they took up stones again to stone him. Jesus answered them, Many good works have I shown you from my Father; for which of these do you stone me? They answered him, saying, For a good work we stone you not; but for blasphemy; and because that you, being a man, make yourself God. Jesus answered them, "Is it not written in your law: I said 'you are gods?" - John 10:30-34,
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Buddha had already warned book-readers
"To find out where the truth lies, you should not depend on certain things: the first is tradition. Also do not depend on hearsay, on the scriptures, on rumours. Do not decide on the good and bad only on the good reputation of a teacher, or on the appearances of things. Remember also that you do not have the means to know all the facts of truth; therefore, you should not come to the conclusion, 'My conclusion is the only true one, everything else is false'. You would become dogmatic."As the wise test gold by burning, cutting and rubbing it (on a piece of touchstone), so are you to accept my words only after examining them and not merely out of regard for me"
Now Orthodox muslims call Polytheists as kafirs and polytheism shirk,then monotheist are the same kafirs for monists.