Why does satan say that he fears Allah? If he fears him, why doesn't he become a Muslim in submission to him? Satan out of all entities probably knows the true extent of Allah's power and dominion. Satan out of all entities probably knows the true extent of Allah's power and dominion
He knows the extend of Allah’s power and punishment. For instance, Sura Anfal verse 48 speaks about the Battle of Badr. When Satan saw Allah’s support for the believers and the angels descending to help them, he got scared.