Luqman - 31:30 For Allah is the Truth, and what they call besides Him is falsehood, and Allah is the Most High and the Greatest.
They have no proof, no evidence that they are God:
The Cattle/6:148 "Those who associate partners will say: "If Allah had not willed, neither we nor our fathers would have associated partners, nor would we have forbidden anything."And those before them denied in the same way until they tasted Our torment. Say: "Do you have any knowledge with you that you can show us? You follow only conjecture (doubtful and contradictory narrations) and you are only guessing."

The Sandhills/46:4 "Say, "Look at those whom you invoke besides Allah. Show me what they have created from the earth. Or do they have a partnership in the heavens? Bring before me a book or a scientific document, if you are truthful?"

The Prophets/21:24 "Have they taken gods besides Him? Say, "Bring your proof. This is the message of my contemporaries and the message of those before me."But most of them turn away because they do not know the truth."

The Cave/18:15 This people of ours have taken other gods besides Him. Should they not have proved by clear proof that they are gods? Who is more unjust than he who fabricates a lie against Allah?

Originator/35:40 "Say, "Have you considered your partners whom you call besides Allah; show me what they have created in the earth?"Or do they have a partnership in the sky? Or have We given them a Book and they rely on a proof in it? Indeed, the wrong-doers give only deceitful promises to one another."

The Family Of Imran/3:151 We will strike fear into the hearts of the disbelievers because they associate with Allah those who have no power or authority. Their abode is the Fire. How evil is the abode of the wrongdoers!

Originator/35:40 "Say, "Have you considered your partners whom you call besides Allah; show me what they have created in the earth?"Or do they have a partnership in the sky? Or have We given them a Book and they rely on a proof in it? Indeed, the wrong-doers give only deceitful promises to one another."

The Heights/7:33 "Say: "My Lord has forbidden only the open and the secret of evil deeds, and sins, and wrongful aggression, and associating partners with Allah what He has not given them any authority or power, and saying about Allah what you do not know."
The Heights/7:71 "He said: "You are condemned to a torment and anger from your Lord. Are you disputing with me about names which you and your fathers invented and to which Allah has not given them any power? Wait, and I am of those who wait with you."

Prophet Joseph/12:40 Those whom you serve besides Him are but names invented by you and your fathers. Allah has not given them any power. The judgment belongs to Allah alone. He has commanded you to serve Him alone. This is the true religion. But most of the people do not know this.

The Believers/23:117 And whoever worships another god besides Allah, who has no proof, his reckoning is with his Lord. Surely the disbelievers cannot succeed.

Those Who Set The Ranks/37:151 Indeed they say because of what they fabricate:
Those Who Set The Ranks/37:152 "Allah gave birth."They are liars."
Those Who Set The Ranks/37:153 Did He prefer girls to boys?
Those Who Set The Ranks/37:154 What has become of you, how do you decide?
Those Who Set The Ranks/37:157 Bring your Book if you are truthful.

The Star/53:19 Have you seen Lat and Uzza (your female idols)?
The Star/53:21 Are the males yours and the females His?
The Star/53:23 They are nothing but names that you and your fathers called them, and Allah has not sent down for them any proof. They follow only their delusions and personal desires, while a guidance has come to them from their Lord.