No society is ever perfectly dystopian or utopian. So no, the Church wasn't absolutely totalitarian because our control over anything, including ourselves, is limited. But in a relative sense, as in compared to the modern freedom of thought, the medieval Church was totalitarian.

Read Paul Johnson's History of Christianity, especially his explanation of how the "total Christian society" formed, for example, by Augustine's rationalizations for using violence against heretics. It's quite Orwellian, including the twisting of New Testament passages to justify Christian violence.

As Johnson says, "the idea of a total Christian society necessarily included the idea of a compulsory society. People could not choose to belong or not to belong. That included the Donatists. Augustine did not shrink from the logic of his position. Indeed, to the problem of coercing the Donatists he brought much of their own steely resolution and certitude, the fantaticism they themselves displayed, and the willingness to use violence in a spiritual cause."

Of course I don't just dismiss Christianity or theism in my writings. As I explain in some recent articles, I do the dirty work of exploring the arguments and the history, to help explain how something so absurd could have come about. So there's a difference between dismissing something and understanding why it should be dismissed.