Dear brother Munir,
As-salamu alaykum
Imagine for a moment when the Quran was being revealed to the 'Mushrikeen'. They believed 'Allah' to be a part of other gods in association, but reigning supreme as the 'high God'.
039.038
“If indeed you ask them who is it that created the Heavens and the Earth, they would be sure to say, "Allah". Say: "Then do you see what you invoke besides Allah? Can they, if Allah wills some penalty for me, remove His penalty? Or if He wills some grace for me, can they keep back his grace?" Say: "Sufficient is Allah for me! In Him do the trusting put their trust"”
Thus, the Quran's guidance was to 'correct' their beliefs and installing 'Allah' as the only God without any other association.
This is why I mentioned in the article:
"Whether we call Him Rab, Lord, God, Almighty, Krishna, Khuda, Yahweh, Elohim, Adi Purush (Timeless being); Para Brahman (The absolute Truth) , El, Eli, Eloi, Jehovah, or whichever beautiful name we call Him, it is with respect, humility and grace that we take His name with the sole intention that He is One and Only One that we serve. That He is alone in His majesty, that He created the Heavens and the Earth and everything in it and to Him is our final return. He cannot be represented by an idol or a statue and is the only One truly worthy of worship."
Therefore, one approach with those who adhere to Hindu theology would be to present them with the notion that God is One, without partners, without any association, earthly or through material representations. This is what the God of the Universe is (whether they call him 'Krishna' or otherwise).
God is an entity, an evident reality and not restricted to a name. We are told to call God by beautiful names (whatever best the human language can muster) and to shun any distortions or profanity in His name. (17:110; 7:180). It is this concept that needs to be cleared. As I mentioned in the article, 'Allah' is simply an Arabic name for God.
I hope that clarifies, God willing
Joseph