Who is the Muslim deity?

Allah is the Muslim deity.

ANSWER

Muslims believe in and worship the creator of all.

The one and only God of Abraham.

4:125 And who is better in religion than one who submits himself to Allah while being a doer of good and follows the religion of Abraham, inclining toward truth? And Allah took Abraham as an intimate friend.

6:161 Say, "Indeed, my Lord has guided me to a straight path - a correct religion - the way of Abraham, inclining toward truth. And he was not among those who associated others with Allah.

This is the Muslims understanding of God:

112:1-4

Say: He is Allah, the One and Only;

Allah, the Eternal, Absolute;

He begetteth not, nor is He begotten;

And there is none like unto Him.

2:256

Allah - there is no god except Him, the Ever-Living, the Sustainer of all existence. Neither sleepiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who is it that can intercede with Him except by His permission? He knows what is before them and what is behind them, and they encompass not a thing of His knowledge except for what He wills. His Kursi (throne) extends over the heavens and the earth, and their preservation tires Him not. And He is the Most High, the Most Great.

God.which mean in Arabic language Allah.