The Church certainly had a lot of power. But it wasn’t absolute power by any means. Medieval culture was a fusion of many things–Catholic Christianity (plus dissenting, unorthodox versions of Christianity that kept popping up in spite of brutal repression), the legacy of Greco-Roman cultures (largely preserved by the Church but still distinct from Christianity in many ways), the pre-Christian traditions of the various Germanic and other cultures that made up Europe, the pragmatic political arrangements that arose in Europe, often in opposition to the Church but sometimes blessed by it, the economic and technological realities that affect so much of people’s daily lives whatever their religion, interaction with powerful (and often aggressive) Islamic neighbors and with the Jewish minority inside Europe, and so on.
One of the things I love about medieval culture is that it didn’t have centralized power structures in the same way our society does. Power was local and almost always pluralized. There was no monolithic “Church” controlling every aspect of people’s lives. That being said, the Church was by far the most centralized, best organized, and most ideologically consistent organization in medieval Europe, and it had an immense amount of both direct power and indirect influence.
Edwin