“Now when the tempter came to Him, he said, “If You are the Son of God, command that these stones become bread.”
Then the devil took Him up into the holy city, set Him on the pinnacle of the temple, and said to Him, “If You are the Son of God, throw Yourself down. For it is written: ‘He shall give His angels charge over you,’ and, ‘In their hands they shall bear you up, Lest you dash your foot against a stone.’ ””
Matthew 4:3, 5-6 NKJV
“Now there was a man in their synagogue with an unclean spirit. And he cried out, saying, “Let us alone! What have we to do with You, Jesus of Nazareth? Did You come to destroy us? I know who You are—the Holy One of God!””
Mark 1:23-24 NKJV
The demons knew exactly who Jesus was. Even when men were blind to the truth, the demons never were. They knew Jesus on-sight. So it is absolutely out of the question that the principle of the legions of demons--Satan--would be in doubt as to the identity of Jesus. You can be certain that Satan knew exactly who Jesus was.
But Satan knows the truth and hates it! So he works to twist and turn it and corrupt it until it is unrecognizable. In the garden of Eden, he began by putting doubt in Eve's mind about the words of God: Did God really say...? And you can imagine Eve's response: I don't know...did God really say that? Maybe God didn't mean what I thought He meant...
If he can get you to doubt God's Word, he can get you to disbelieve, and then he has you; that is, he's gotten you to sin because unbelief shows a lack of faith in God's character. Basically, unbelief calls God a liar.
So what did Jesus do when Satan called into question His identity--that is, what God had just said at Christ's baptism at the end of Matthew 3: This is my beloved Son in whom I am well pleased?
Jesus fought back with the truth!!
He reminded Himself and the devil of what is and always will be true. Doubt found no place in Jesus; He knew God and trusted Him; He knew the truth and was prepared to use it in battle against the enemy.
When the adversary comes at you with doubts, trying to get you to disbelieve God, fight back with what you know to be true. Fight back with the Word of God!
“For what if some did not believe? Will their unbelief make the faithfulness of God without effect? Certainly not! Indeed, let God be true but every man a liar. As it is written: “That You may be justified in Your words, And may overcome when You are judged.””
Romans 3:3-4 NKJV