The Catholic church is more vibrant than ever, and still holds substantial sway over many many people. Most modern organizations are unable to hold as much sway over members as the Catholic church does. If anything, the church is a case study in how to make an organization relevant over the course of millennia.
Your point on scientific progress is especially obtuse, given that the entire reason for the study of science in the West was at the behest of Christianity. I can't think of any time the church sought limiting scientific progress as an end unto itself.