Protestantism stemmed from the Reformation. Protestantism at its most basic is the belief in justification by faith alone, the priesthood of all believers, and the supremecy of the bible. There are countless protestant denominations and none of them can agree on anything beyond that. Some Baptists dislike being labeled Protestants and insist that they are christians while some Anglicans define themselves as Anglo-Catholics. Most Protestants are very decent people and are interested in serving God in the best way possible. Unfortunatly, protestantism has been tainted throughout the years by racism, elitism, anti-semetism, and worst of all, violent anti-catholicism.
Protestatism and Catholicism should get along since they are both worshipping the same God.