One, without equal nor associate the Creator and Sustainer in all Universe.
Belief in Allah is the foundation to the religion of Islam.

GOD is ONE

No human language is good enough to describe God, for there is nothing else like Him. God’s nature is far beyond our limited conception. Nevertheless, we do know that He is one. Allah, the one true God, is not far from us, for He is with us always. The Quran says:

‘We (God) are nearer to him (man) than his jugular vein’
(Quran 50:16)

Islam is a strictly monotheistic religion.
The key Surah (Chapter) is the Quran testifies to Islam’s monotheism.

Say : He is Allah, the One!
Allah, the eternally Besought of all!
He begetteth not nor was begotten
And there is non comparable unto Him
(Quran 112)

Allah is one, and only He is God.
He is the only one worthy of worship. Allah said,

‘Choose not two Gods. There is only one God.
So of Me, Me be in awe’
(Quran 16:51)

Islam makes it clear that God has no son, no father, no brother, no wife, no sister and no daughters.

In His unity, God is not like any other person or thing that can come to anyone’s mind.

His qualities and nature are conspicuously unique.

He has no associates.