M
mercygate
Guest
Post Acts? like the canon of the NT? The Holy Trinity?The question is when, for example, did particular beliefs and practices come about. It is easy enough to identify new beliefs and practices in Catholicism. For example, unil Vatican II mass was conducted in Latin with the priest turning his back to the congregation. After Vatican II the Church instituted new practices. Similarly, belief in the Immaculate Conception was not a (general) belief in the early Church.
Protestants cut themselves off from most the post Acts innovations of the Catholic Church through sola scriptura. What distinguishes Protestans from Catholics are (primarily) the post Acts innovations.
We distinguish disciplines from dogmas. The Mass has always had different forms in the Eastern Churches from the Latin Church. Even the Latin Church had variations in form before Vatican 2. At Trent, Religious Congregations with a long-established particular use were allowed to keep their forms. The Carthusians, Dominicans and Carmelites all enjoyed this privilege. Interestingly, it was AFTER Vatican 2 that these communities began dropping their own usage.