Think about this before you start condemning others due to their religious (or non religious) belief systems.
Is there a single religion anywhere in the world that has not been tainted by extremism, violence and other abuses? I am struggling to think of any at all. (I am including atheism in this also)
The answer to peace lies within acceptance and tolerance of the differences we have. To embrace that we can each have a belief system (or not) that is different from others.
By alienating, hating and dehumanising anyone because of their belief system is itself a path to destruction and provides the necessary environment for extremism to exist.
Get to know the people around you, accept them for who they are, do not try to forcibly convert them to your ideologies or belief system. Let there be a meeting of minds and hearts.
Have a good open conversation not just about what someone believes, but why they believe. It is a fantastic thing and sometimes you find you have similar experiences even though the outward expression may be different.
Perhaps you will find out more about other people and even more about yourself.
Think about it.