What fundamental beliefs that aren't also part of Catholicism are shared by all Protestant denominations?

[CATHOLIC ENCYCLOPEDIA (1917): *Protestantism*](https://www.newadvent.org/cathen/12495a.htm#:~:text=Catholicism%20numbers%20some%20270%20millions,their%20only%20common%20denominator.) : > ### Conclusion > Catholicism numbers some 270 millions of adherents, all professing the same Faith, using the same sacraments, living under the same discipline; Protestantism claims roundly 100 millions of Christians, products of the Gospel and the fancies of a hundred reformers, people constantly bewailing their "unhappy divisions" and vainly crying for a union which is only possible under that very central authority, protestation against which is their only common denominator. That final claim, that protestation against the central authority (of the Catholic Church), is their only common denominator, seems too extreme. But is it? What fundamental beliefs that aren't also part of Catholicism are shared by all Protestant denominations?