If we agree that the universe is infinite then we cannot...
If we agree that the universe is infinite then we cannot even imagine another physical universe, for whatever you imagine will be within our infinite universe. The concept of Unique Unity of God is one of the most purely Islamic contributions about the true concept of God which was never discussed among other philosophers or theologians.
The Most Perfect Description of Unity of God Chapter 112 of the Holy Quran which is the Chapter of Purity in Monotheism describes the unity of God in the most perfect way: “Say ***: He is Allah; the Unique*** (Ahad) .. and there is none coequal to Him ”.
Imam Ali (a.s) in introducing this Unity of God in Nahjul-Balagha says: “He is One but not by the first in counting” [^3] The Imam also in response to the man who had asked him about the concept of unity of God during the battle of Camel told him: “ O Bedouin! When we say God is One could have one of the four meanings, two of them are impossible about God and the other two are correct. The ones which are not possible are: To say God is One and you mean numeral unity.
This is not true because when something doesn't have second, does not enter in numbers. Thus God considers those who said ‘God is one of the three' polytheists. Similarly, if you say God is One and mean One in His kind, is incorrect, for it means you have imagined another one like unto Him.
But to say God is One in that there is none like or coequal unto Him is correct, as it is correct to say God is Unique in His Essence in that there cannot be another one be it in our imagination, mind, or outside. Such is our Lord God”. ^4 ‘I' or ‘WE' If there is only One God, why God in the Quran in many instances refers to Himself utilizing the plural pronoun?
Eternity ( Al-Azaliyyat) Another concept about Monotheism in His Essence that we need to be familiar with is about the true meaning of His Eternity. What do we mean by saying that God is Eternal or perpetual? When we say someone or something is eternal it normally means that it exists at all times without change; thus ‘the eternal city' was an appellation of Rome. Is it the same when we say God is Eternal? Nay.
The Eternity of God does not only mean that His existence is timeless and He is perpetual. No doubt, He always existed and will always exist. But this meaning of eternity would limit God in time, whilst He is the Creator of Time and Place.