Glance through these articles:
https://en.wikipedia.org/wiki/Protestantism
https://en.wikipedia.org/wiki/Protestant_culture

(if you want more info > https://en.wikipedia.org/wiki/Protestantism)

The Big Question is here:
Catholic church is one = there is only one catholic church
There are "countless" protestant churches. Become familiar with the articles and you will understand. 
But why? Why are there so many different protestant churches?
Don't waste you time googling for answers. Glance through the articles and be creative!