The Church is not merely a human organization. Fundamentally, if you want to know why I am Catholic it’s because I encountered Jesus Christ. Jesus Christ founded the Church and I am Catholic because I want to be part of the Church he founded. It’s not because I was baptized Catholic or I think that people with white hats that are pointy are so great. It is not a human institution that I am putting my faith in. I am putting my faith in Jesus who founded the Church.
We don’t relate to the Church as a merely human institution. The Church has many human components (weak sinners as members) but it is founded by Christ, and it is his mystical body. We trust that Jesus is running the Church. This is not a blind, unthinking, reactionary stand. Rather, it is rooted in faith.
Jesus intentionally founded the Church on his own authority. It is his Church. Jesus stated this explicitly to St. Peter, “…and upon this Rock I will build my Church” (Matthew 16:17). So who’s church is it? Jesus’ Church. Who’s building the Church? Jesus, it's his Church, he’s building it. If we get that then we see how he identifies himself with his Church.
In fact, when Saul persecutes the Church, what does Jesus say? “[Saul] fell to the ground and heard a voice saying to him, 'Saul, Saul, why are you persecuting me?' He said, 'Who are you, sir?' The reply came, ‘I am Jesus, whom you are persecuting'” (Acts 9:4-5).
Jesus takes it personally when the Church is persecuted.