Um, Jesus establish His Church. That doesn’t say Catholic Church. Would you lay the Inquisition and all the other abominations under catholic rule at Jesus’s feet? Do you get saved over and over, or have you mastered the yoyo and only get resaved occasionally?
It became known as the Catholic church within the first century...The inquisition was mankind's way of facing a threat which they could not comprehend....their religion, the ONLY Christian religion on Earth, which they knew to be the Holy church of Christ was under attack from a recently formed group of dissidents....they had seldom faced such opposition and thus acted accordingly....with complete and cruel and harsh retaliation.
These were not mild mannered protestors, they destroyed churches, libraries, monasteries, and were above and beyond any other evils that they had witnessed....they didn't know any other way to defend the church.