Anyway, what is the "faith, true Mass, and sacraments" without the head of the Church?! Might as well become Orthodox, no?
The pope is the servant of the Faith, Mass and Sacraments. He has authority only if it is subjected to Divine Law. The Faith, Mass and Sacraments exist when there is no pope, or when the pope is bad, or if he is a saint. This is because the Church is Christ's Bride, of Divine origin, while the occupant of the papacy is merely human.
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To answer your question, "What is the Faith, Mass and Sacraments, without the head of the Church?" They are the essence of the Church, which still exist even if the head is temporarily gone or deficient. The Church can easily survive without a pope (in the short term, as history has shown); whilst without the mass/sacraments, the Church ceases to exist.