A while ago I listened to Colin Donavan on Catholic radio, and I understood him to say that Luther’s Letter to the German Princes of 1521 was where he definitively called for a new religion separate from the Catholic Church. Here are some elements from the letter that illustrate this.
Letter to the German Princes by Martin Luther
“[F]asts must be made optional, and every kind of food made free.”
“[We] should abolish all saints’ days, keeping only Sunday. [All other feasts] should be held on Sundays, or only in the morning with the mass; the rest of the day being a working day.”
“It [is] also right to abolish annual festivals, processions, and masses for the dead, or at least to diminish their number. … [And] we should abolish church wakes.”
“[T]he devil [has] lead us astray, to [set] up pilgrimages, to found churches and chapels, to glorify the saints, and to commit other like follies.”
“The country chapels and churches must be destroyed, such as those to which the new pilgrimages have been set on foot: Wilsnack, Sternberg, Treves, the Grimmenthal, and now Ratisbon, and many others.”