Salam
Everyone assumes he believes in God but is disobeying, and hence his disbelief is due not being submissive, but I find opposite proof to this in Quran. He does not believe in God and I've tried to show the way he talks to God is sarcasm to Ahlulbayt about the God as if talking to God that they believe, he is talking to the veils, in a sarcastic way as if the voice utter through them is not God but definitely a falsehood.
Today, I was rereading tuhuf al-Uqool, and in it I found:
Harun asked the Imam (7th Imam) about the first one who apostatized and became an atheist. The Imam (peace be upon him) answered:
The first one who apostatized and became an atheist in the heavens was Eblis the cursed. He showed arrogance and took pride in himself against Adam (peace be upon him) the choice and confidant of God. The cursed said - as it is mentioned in the Quran-:
I am better than Adam, for You have created me out of fire and Adam out of clay. [309]
Thus, he rejected the Lord’s orders and became atheist. His offspring inherited atheism from him.
Harun wondered whether Eblis has offspring. The Imam (peace be upon him) answered:
Eblis has offspring. Listen to God’s saying:
When We told the angels to prostrate before Adam they all obeyed except Eblis. He was a jinn and he sinned against the command of his Lord. Why do you (people) obey him and his offspring instead of Me, even though they are your enemies? How terrible will be the recompense that the wrong doers will receive! I did not call (the unjust) to witness the creation of the heavens and earth nor to witness their own creation nor did I want to be helped by those who lead people astray. [310]
They mislead the offspring of Adam through their false vanities and lies. Meanwhile, they declare that there is no god but Allah. God describes them in His following saying:
If you ask them, "Who has created the heavens and the earth," they will certainly say, "God has created them." Say, "It is only God who deserves all praise, but most of them do not know." [311]
This means that they declare so only with their tongues because they used to say so as one of their customs. He who does not believe, even if he declares with the tongue, will be suspicious, envious, and resistant.