Luke 1: 34-36 "...yet Miriam said to the messenger, 'How shall this be, since I know not a man?' and answering, the messenger said to her, 'Holy spirit shall be coming on you and the power of the Most High shall be overshadowing you; wherefore also the holy One Who is being generated shall be called the Son of God...'"
In the above verse the holy spirit is equated to the power of God and the result of its union with Mary shall be called the Son of God. If the Son of God was already a fixed title, wouldn't the words "is called" instead of "shall be called" be better? The role of the Son of God only began when God emptied Himself and took on human form
