Opposition to Gods word
Genesis 3:4 Then the serpent said to the woman, “You will not surely die.
5“For God knows that in the day you eat of it your eyes will be opened, and you will be like God, knowing good and evil.”
God said, in the day you eat of it, you will die. Satan here, clearly questioning and opposing Gods word, even implying God is lying. Satan is a liar and the father of them. He implies God is holding back something from them. Instead of death, you will be godlike. Simple never true. Satan was judged due to his desire to be god. Didnt work well for him. We are Gods creation. We would be wise to stay in our lane.