Jehovah's Witnesses, how can it be that Jesus and Michael are the same, if you read Luke 1:35?

35 The angel answered, “The Holy Spirit will come on you, and the power of the Most High will overshadow you. So the holy one to be born will be called the Son of God. I was told by a Jehovah's Witness that it was the life force of Michael the archangel that was put into the Virgin Mary, so that Michael and Jesus are the same. Is this correct teaching and where in the Bible does it say such a thing?