А это очень распространенное мнение в богословии, и не только в Православии. Например, могу процитировать лютеранина, известного богослова F. E. Mayer, The Religious Bodies of America, Concordia, 1959 (c 32-33, если тяжело читать, прочтите только последнюю фразу): There is probably no other Church which has the capacity for harbouring so many widely divergent theological points of view as the Roman Chruch. It condemned the Modernist Loisy, but not Abelard, who outliberalized the most radical liberal theologian of modern Protestantism. In one country Rome will unrelentingly enforce the principles of Unam sanctam, in another country it will accommodate itself to the prevalent political or religious views. Leo XIII proscribed participation in the Interfaith Conferences, but in a letter to the Bishop of Grenble, 1892, he states that Christain prudence suggests interchurch co-operation in the intereste of social welfare. The priests of some Uniate churches may marry while others must be celibates [...] The problem lies in the fact that , ... the Roman Catholic Church is really a complex of seven different types of religion. [...] The Roman Chruch can take various forms without ever relinquishing one iota of its basic characteristic: obedience and submission to the Roman pontiff as the indispensable condition of salvation.