There were heretics who crept into the church the Alogi and the Ebionites denied the deity of Christ in the early Church.
Then Arius denied the deity of Christ as he regarded Christ as a demi-God. In our modern Church the
Jehovah's Witnesses, Iglesia Ni Chisto (Filipino Cult) and Unitarians and the Modernists deny his deity.
The Son who is God from eternity took upon himself man's nature. He was fully God and fully Man.
Joh 8:58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.
Joh 20:28 And Thomas answered and said unto him, My Lord and my God.
Joh 10:30 I and my Father are one.