Why can Allah not become a man & enter into His creation?

The problem is, Jesus already entered His creation as a man, and proved there is no Allah, nor Muhammad to represent God. Jesus alone provided the way of salvation, and Islam has no such provision for sin. Christianity is the only way to be saved, and Jesus is the WAY. John 14:6 and Acts 4:12 make this perfectly clear, no matter what the Qu-ran says. Romans 10:9-10 is the only way to be born again, and have eternal life.