Frustration with the Church's limits on independent thought.
Explanation:
This was the main attitude towards religion that acted as a cause of the Enlightenment. The Enlightenment was a time period of great scientific and scholarly advancement. During this time period, many people were interested in engaging in independent thought, and exploring humanistic ideals that had been neglected in the past. However, the Church was not always accepting of this. Therefore, one of the reasons for the Enlightenment was to react against the Church's limits on independent thought.
