Even the devils knew Jesus was not the son of God Including Satan.

Whenever the impure spirits saw him, they fell down before him and cried out, "You are the Son of God." (Mark 3:11)

"If you are the Son of God," he said, "throw yourself down. For it is written: "'He will command his angels concerning you, and they will lift you up in their hands, so that you will not strike your foot against a stone.'" (Matthew 4:6)

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You maybe be thinking, how are the devils including Satan denying Jesus is the son of God? Rather they are confessing he is.

"are they"? Not according to what Jesus said

You belong to your father, the devil, and you want to carry out your father's desires. He was a murderer from the beginning, not holding to the truth, for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies. (John 8:44)

Notice how Jesus is testifying to the Jews about Satan and his followers (devils) "for there is no truth in him. When he lies, he speaks his native language, for he is a liar and the father of lies." if we are to take what Jesus said then this means, when Satan and the devils confessed Jesus was the son of God they "lied"

Now ask yourself when "Satan and the devils" said Jesus was the son of God, did they lie or speak the truth? If you say they spoke the truth, then this makes Jesus a liar. The problem Christians face is when Satan quoted the scriptures did he lie or speak the truth?

For it is written: "'He will command his angels concerning you, and they will lift you up in their hands, so that you will not strike your foot against a stone.'" (Matthew 4:6)

Did Satan speak the truth when he quoted the scripture or was it another lie as Jesus affirmed? The ironic part is Jesus even rebuked the devils for calling him the son of God, which says a lot.

⁴⁰ At sunset, the people brought to Jesus all who had various kinds of sickness, and laying his hands on each one, he healed them. ⁴¹ Moreover, demons came out of many people, shouting, “You are the Son of God!”But he rebuked them and would not allow them to speak, because they knew he was the Messiah. (Luke 4:40-41)