The Christian church is 2000 years old. Most of the 20,000 Protestant sectarian groups are less than 100. Only the Catholic Church has been there the whole time. Yes, many Church leaders have sinned and betrayed the Lord. That started in apostolic times and continues to this day. But do you really think the Holy Spirit abandoned the Church for 1500 years awaiting the Reformation? The Lord did not throw us an instruction manual without giving us a Church, guided by the Spirit, as a guarantor of correct interpretation. Who could be better at interpreting the love letters of the Groom than the Bride? You know what many Protestants say about the Catholic Church, find out what the Catholic Church says.