Christians have always maintained that Jesus was BOTH Man and God..... not one or the other.
1 Timothy 2:5 says “For there is one God and one mediator between God and mankind, the man Christ Jesus.”
Originally Christians taught that Jesus was a man while on earth. The idea that he was God and man at the same time came in the fifth century at Chalcedon.
https://en.wikipedia.org/wiki/Council_of_Chalcedon