Catherine Torres commented on "Faith" seems too easy

I'm inspired by the notion that religion actually causes rifts and hatefulness towards anyone who disagrees with said religion, typically extremists types- we're seeing it in ISIS, hard-core Christians who claim the Bible is the last say on everything, those 'preachers' on TV who take money from impressionable believers (thanks John Olivier for your news story), and even going back decades with the Jews and Palestine. Im trying to wrap my head around the notion that something that should be good is actually quite evil at times. 

In my story, I'd like to have the world come to the same conclusion after an unspeakable WWIII, one fueled by religious beliefs. I don't think I want religions banned, per se, merely discouraged. As in all the world leaders decided after the war to do away with religion and the world citizens were persuaded. 
Questions I'd like to answer: Is a religion-less world better off, and if so in what means? Will the people who still believe in a God be labeled and discriminated? Will people still yearn for religious traditions? What will I do about Christmas and Hanukkah? Will there be sects of people unwilling to give up beliefs?
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