Atheists don’t reject god
A claim that is popular among those who try to discredit atheism is, “Atheists reject god”.
For this to be true atheists would have to believe that a god exists. How can someone reject what doesn’t exist? That’s practically impossible. So atheists would have to agree with believers that their god exists and they choose not to believe in this thing that both parties agree exists.
If you told me flying cows existed and presented a detailed definition of a flying cow and why you believed they existed, it would be impossible for me to disbelieve in flying cows as if they existed and I was choosing not to believe in them. All I can honestly and practically do is refuse to accept your definition as it cannot be supported with evidence.
Gods exist in the definition their believers employ. The Christian god is defined by Christians. The Roman gods were defined by Romans.
The definition is the only rationally defensible place a god exists.
And atheists reject those definitions. They find them illogical and contradictory, unsupported by verifiable evidence.