That's a good question. Personally, I believe that a lot still would, though not so many nor so often as do now. People have a natural curiousity and sense of awe that leads to, for lack of a better word, "spiritual" conclusions. People have a lot of other natural traits too, though.
Clerics are people, just like everyone else. It's perfectly natural for them to try and exert control and establish authority. That's what people do. We call it by a lot of names, ambition, dedication, and passion among them, but it all comes down to trying to control the actions of others, to guide their decisions according to your own principles.
I believe that's where the carrot and stick of heaven and hell came from. You can get people into the pews -- or into the church, for the Orthodox -- more easily through fear than any other emotion.