The center of Christianity is the coming of the Son of God into the world as a real man to destroy the works of the devil and create a new people for His own glory. The very heart of our faith is that He did this by obeying the law of God, dying for the sins of His people, rising victorious over death, ascending to God's right hand with all His enemies under his feet. The second coming of Christ is the completion of His saving work. If you take it away, the whole fabric of His saving work unravels.