But, you believe Jesus is God, right? This seems to be the indication in your post, "When God became a man." Assuming you believe Jesus is God, how can God (an uncreated being) be an angel (a created being)? Or, are you saying that God created Himself?
If Jesus is God and/or the Creator, He cannot be an angel, unless He became an angel after creation. The Bible says nothing of Jesus becoming an angel, the Bible only teaches of Jesus (the Word) becoming a man, a little lower than the angels.