I feel like your first paragraph needs one more sentence. You build up a great sense of the way this phenomenon manifests when people "rock the boat" and challenge the status quo... but you need one more sentence at the end of that first paragraph to sum up the MESSAGE OF YOUR ESSAY.
Here is the message: "Thankfully, people are able to learn "uncomfortable truths," for without them we should remain in bloody and uncivilized ignorance." Move this to the end of the intro.
Revise these paragraph topic sentences so that they are worded in a way that supports the main argument/message of the essay:
The Church of Rome dominated all spectrums of European life from the third century forward.
The idea that "all men are created equal" was a direct attack against the "divine right of kings" and the long-held view that the commoner lived a life in bondage to the Crown. But even this attack carried its own hypocrisy: Slavery.
The first sentence of each paragraph should be a PARAGRAPH TOPIC SENTENCE. The topic of each paragraph is some idea that supports the main message of the essay.
So... just add definition by adding that thesis statement at the end of the first paragraph, and then revise the topic sentences to support that thesis statement.
Then, you'll need to add a conclusion paragraph...
:-)