There were two main religions in Europe. These were characterized as Catholic and Protestant.
Both parties were dedicated to their own religion, and despised the other whole-heartedly. As a result, the reformations started many religious wars fought by both religions. These wars caused many things. First, it caused the groups to realize that there will be multiple religions worshiped, despite the number of wars fought to wipe out the other. Next, it caused people to start questioning religion (This did eventually subside). It