Allah is one and does not have partner
In the name of Allah , most gracious most merciful
Surah 112: Purity of Faith - al Ikhlas
In the name of Allah, the Beneficent, the Merciful!
Say: He is Allah, the one and only God the Eternal, the Absolute He begot none, nor was He begotten and there is none comparable to Him.
This short surah is "equivalent to one third of the Qur'an" according the hadith of the prophet Muhammad (pbuh)
Ayetul Kursi
“God — There is no diety save Him, the Ever-Living. The Self-Subsistent Fount of all being. Neither slumber overtakes Him, nor sleep. His is all that is in the heavens and all that is on the earth. Who is there that could intercede with Him, unless it be by His leave? He knows all that lies open before men and all that is hidden from them, whereas they cannot attain to aught of His knowledge save that which He wills (them to attain). His eternal power overspreads the heavens and the earth, and their upholding wearies Him not. And he alone is truly exalted, tremendous.”
— Qur’an 2:255
As you see definition of the Creator is simple and clear in the Quran.
There are perhaps small differences in the faith of Groups but no one can question onness of Allah in islam .
We believe Allah is All-capable .
The sentence the God can create another god or partner is absurd , because a created being is not god.
Allah is everywhere in other words : Allah does not depend on relative time and space ,that we or all other creatures depend .
Noone can question that either.
Peace