There was a time when only the church has control over who got access to books and what books were allowed, it was called the dark ages.

There's a reason why modern historians don't use the term "dark ages" anymore. That period wasn't a period of horrendous decline or anything, the "dark" refers to a gap in the historical record because fewer records were being kept and/or survived from this period. For the average person, the only thing that changed with the fall of the Western Roman Empire was the noble collecting their taxes.