Christianity is usually called a religion. As a religion it has had a wider geographic spread and is more deeply rooted among more peoples than any other religion in the history of mankind.
The restriction of religion to private life therefore does not necessarily threaten the vital interests of the majority religion if there is one and it protects minority religions from tyranny of the majority.
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I read Christopher McDougall's book 'Born to Run.' If running were a religion this would be its bible. I actually scribbled my favorite passages on my arm to read during the race.