Protestants do not rebel against the authority of the Church which Jesus established…we simply do not believe that authority resides in the Catholic Church…or the Orthodox Church…the same question you have asked has been asked of Catholics by Orthodox…we believe differently than you do what constitutes the Church…you cannot impose YOUR beliefs on what the Church entails upon US as they are different.
The Church are those whom Christ has redeemed, it is composed of those who walk in newness of life. It is visible when two or three are gathered together in His name through faith in His work…it is invisible in that members are found in each faith community, there is only One Church, One Body, One Baptism…it’s membership is not determined by adherance to doctrine and dogmas determined by an institutional heirarchy, it’s membership is drawn together into newness of Life by the Holy Spirit, he makes us One out many.