Satan saw in Jesus an extraordinary human being Whom he suspected of being the Messias and the Son of God. Hence he prefaced each of the temptations with the conditional “if.” If he had been sure that he was speaking to God, he would not indeed have tried to tempt Him.
Nonetheless, Satan is so proud and bold and uncontempt, that even knowing Jesus was the Son of God, he would have tempted him anyway. As someone once said, we cannot ask the devil continency to endure his own temptation to tempt others
