At the beginning of the 21st century, especially for those of an English-speaking Christian background, religion is not very central to life.
So, the Reformation period is often of remote interest for what relevance could it possibly have to our world?
Of course, this is precisely the point. English society (and the English Church) is the way it is largely because of the changes brought about under the Tudors.
This means that to understand the modern world, we must understand how it evolved.
You must understand that the church and society were not always as they are in the 21st century.
This may seem obvious but, for all that, it still needs to be firmly grasped before you can truly appreciate the magnitude of the topic.