I come from the Scriptural and historical belief that Christ did found a Church and that it was/is the Catholic Church. I believe, as the Church has always taught that it has the fullness of truth revealed by God- the Church, the magesterium, nor the people within the Church, do not make up the teaching- but the Holy Spirit has protected the Church from error when teaching definitively on faith and morals. Human beings are fallible, including the pope, but the Holy Spirit is not. The Catholic Church is NOT a man-made institution. It is God's. It is not ours to mess with, but to preserve and follow.