I believe a church evolves, just like animals do, albeit a lot faster.
A church that has evolved without a minister is a different animal than a church that has evolved with a minister. So the church without a minister has evolved into -- let's say, a penguin. And they look at themselves at say, Yes, this is what a church looks like, and this is what a church is supposed to do -- swim.
But they're not doing much growing, because all they do is swim and eat fish in their tiny little pocket of the world. So they hire a minister, who evolved to be a purple martin. And the martin says, Okay, it's time to fly! But the penguins look at her and say, "What are you talking about, birds are supposed to swim!"
The martin somehow manages to convince them to come up on the roof with her. They're looking a little leery, so she gets them to the edge and then pushes them off, expecting them to be like baby martins and open their wings and fly.
Splat splat splat.
They didn't evolve to fly.