If Satan really wanted to face Jesus Christ in a battle, he will be facilitating the End of the Age by helping to spread the gospel to the whole world. This must be fulfilled for the End to come. Matthew 24:14

Satan doesn't want the gospel to be preached in the whole world because he is afraid of what comes after that - the End of the Age. Matthew 24:14

Jesus is not asking you to sell the gospel; Jesus is asking you to preach the gospel. Mark 16:15

You cannot give what you don't have; you must be truly saved to preach the gospel.