How can one respond to the whispers of Satan that cast doubt upon the Oneness of the Creator, and which claim the possibility of other gods for other creatures?

One must believe that Allah is All-Knowing and All-Powerful over everything, possessing absolute perfection, and it is impossible for Him to be described with any attributes of imperfection. Ward off the whispers of Satan by saying: "I believe in Allah," seeking refuge from Satan, occupying oneself with what is beneficial, and knowing that these whispers do not cause harm as long as one strives against them and dislikes them.