Yes. anything which takes the place of God in ones life is their god.
Anything which causes a lack of faith and love for the true God, is their god. They are even their own god. This is what Adam wanted, to be god. That was his sin and the first sin in existence.
Adam/anointed cherub, said, I am God. I sit in the seat of God. But God said you are just a man and I have driven him out of Eden for his wickedness. Eze. 28.
So all of this, I know God does not exist stuff, is their being a god to themselves, for they do reject the true God and set up their own words.
Good question.