May peace be upon you.
On many verses in the Quran, God order people to
worship only one God and no one else.

Islam does not teach polytheism such as Greece belief
that worship many Gods such as Jupiter, Mars, and
Apollo, or the Christians that worship the Father, the
Son, and the holy spirit.

“Allah! There is no god but He, the Living, the
Self-subsisting, Eternal. No slumber can seize Him nor
sleep. His are all things in the heavens and on earth.
Who is there can intercede in His presence except as
He permitteth? He knoweth what (appeareth to His
creatures as) Before or After or Behind them. Nor
shall they compass aught of His knowledge except as He
willeth. His Throne doth extend over the heavens and
the earth, and He feeleth no fatigue in guarding and
preserving them for He is the Most High, the Supreme
(in glory).” [Al Baqarah:255]

“Allah! there is no god but He, the Living, the
Self-Subsisting, Eternal.” [Ali Imran:2]

On the above verses, the Quran explains that God is
the Living that could not be crucified or killed. He
is not sleepy or sleep. He feels no fatigue even after
creating the universe and maintain it. He knows
everything.

“There is no god but He: that is the witness of Allah,
His angels, and those endued with knowledge, standing
firm on justice. There is no god but He the Exalted in
Power, the Wise.” [Ali Imran:18]

There are many more verses in the Quran that order
people to worship only one God and no one else.
Polytheism is an unforgivable sin in Islam:

“Allah forgiveth not that partners should be set up
with Him; but He forgiveth anything else, to whom He
pleaseth; to set up partners with Allah is to devise a
sin most heinous indeed.” [An Nisaa:48]

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