Just because a gospel was rejected by the politicians who were most succesful in ruling the church doesn’t mean they are any more true or false that the gospels that were chosen to be included. The words may be inspired from God, but the selection of which works to approve was done by men.
Yes, they were done by men, but not just ordinary Joe Schoes from Kokomo.
Jesus commissioned His Apostles to teach all nations. He commissioned the Twelve, then the Seventy-two.
He commissioned Peter and told him: whose sins you shall forgive, they are forgiven; who sins you shall retain, they are retained.
The Apostolic Tradition continued all these 2000 years with the EARLY Church fathers deciding on early issues, mainly heresies. But, over the millenia these Church fathers continued to deal with the business at hand.
The early Church had only priests and bishops. As the Church continued to grow the necessity for a larger bureaucracy became apparent. It used to be that ALL bishops had to be consulted for EVERY problem and dilemma. They were the ones who elected the pope. That got way too unwieldy. So, the Church appointed another layer of bureaucracy to cope with their growth.
Cardinals are first priests, then bishops, then cardinals. The cardinals still elect the pope.
All men ordained are priests. Fewer become bishops. Even fewer become cardinals. It's pretty simple really and not much has really changed over the millenia.