The history of the Catholic Church is an epic spanning 2000 years and is essentially the history of Western Civilization. It is important for every Catholic to be steeped in that history. Unfortunately, our history is often told by those who unfairly revise it and take events out of context leading to many untruths and Black Legends that have been passed down through the centuries and used to paint the Church in an unfavorable light. An honest telling of the story, remembering its contextual significance, is a history Catholics can be proud of.
There are many excellent sources to obtain an honest presentation of Church history that you should seek out.