For most Jews, even an all-powerful G-d cannot become a human incarnation since such a process is tantamount to imperfection on the part of G-d, Who is perfect.
…to which the Christian response would be that Christ was perfect, leading a sinless life, without blemish.
G-d can only be G-d as an incorporeal spiritual entity. He cannot be human just as He cannot be demonic and cannot be pantheistic or merged with His creation. This is not considered a limitation in the ordinary sense.
Christ reflected no human limitations in the ordinary sense. He lived an entirely Divine, supernatural life.
How else do we as Christians explain the following, in no particular order?:
Christ’s miraculous birth to the Virgin Mary
Christ’s teaching in the Temple in Jerusalem as a young child
The Sermon on the Mount
His many miracles, including healing of the sick, the blind, and more
The Miracle at Cana
The Transfiguration
His Resurrection
The Descent of the Holy Ghost upon the Apostles
The Communion of Saints
Preaching of the Gospel to the Gentiles by Ss. Peter and Paul and others
Miracles associated with the institution of the Mass
The Sacraments of the Catholic Church
These are not the signs of an ordinary, human life, but a life of One filled with the Holy Ghost. The Word became flesh, and dwelt among us, as the Book of John states.