But religion is not the only cultural phenomenon that stops groups of people from mixing.
He himself might possibly have dreamed up such an act of sudden violence for one of his plots, but religion would never have been the motive.
Kenya is filled with young hopefuls for whom running is not just a sport but a religion -- and for a lucky few, a path out of poverty.
Some have described it as religion, but that is doing a disservice to religion.
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"It's more natural for people to say Notre Dame exercises religion, but when you say this power tool company exercises religion, you have to explain it little more, I think the claims are really the same, " said Kyle Duncan, general counsel for the Becket Fund for Religious Liberty, which represents many of the plaintiffs.
I'm with sticking to traditions and your religion but you can work while holding on to your traditions.
But politics and religion will be mingling all this week when Democrats convene in Denver to choose Barack Obama as their presidential nominee.
On Monday, two U.S. officials said preliminary evidence from an interrogation suggests the brothers were motivated by religion but were apparently not tied to any Islamic terrorist groups.
But every known religion has some sort of rite or procedure for taking people out of their ordinary lives and opening them up to something larger than themselves.
But as several religion-watchers have noted, the church would risk sending an odd signal to the country and the world if it rejected him in favour of a safe, white pair of hands.
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The Pew study found that the new Asian immigrants identify themselves, surprisingly, as 22% Protestant and 19% Catholic, but whatever their religion, most of them have in spades what Max Weber called the Protestant work ethic.
But how does religion do this?
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He did tweet about religion, but they were hardly the words of a hard-core zealot.
Self-improvement has forever been an American religion, but the norms about what is normal keep changing.
But in America, religion has always been a competitive affair, founded on personal belief.
We may have a hard time criticizing a church or religion, but taxing them might be different.
By all means let us have debates on religion, but let's do so without insulting each others' beliefs.
Life is easier, too, for those who wish to leave organised religion behind but still remain part of the club.
Very few were concerned about mixing with children of another religion, but those who did have worries about it talked about possible sectarianism.
Netanyahu's findings led to his revolutionary conclusion that the Spanish Inquisition did not target the Jews as a religion, but the Jews as a race.
The form was compulsory, but a question about religion was optional.
Although classified by the Registrar General for Scotland as a form of religious marriage, humanism is not a religion, but a secular philosophy or belief system.
It came about not because New York got green religion, but because the population, unlike that in most of America's other large, old, north-eastern cities, is growing.
It treated numerous subjects from politics to religion, but it of course it was also very much attuned to popular culture, as the images I have selected suggest.
"In the 18th Century, that model of religious tolerance based on a state with diverse cultures, but no single dominant religion, became a model for the founding fathers, " said Mr Raby.
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Although a source of inspiration for European and American philosophers, the state model created by Cyrus, based on diverse cultures, but no single dominant religion, was only picked up on in the 18th Century United States.
BBC: Cyrus Cylinder: How a Persian monarch inspired Jefferson
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