I'm going to start a series next week, taking one world religion at a time and attempting a 50,000-foot view of origin, founder (if any), holy book(s), and major holy days or celebrations. It seems to me that this is a significant part of culture that many people overlook.
I grew up in a religious family, where our faith was a big part of our lives, and not just on Sunday morning. I have known many people in the United States for whom that is also true. A few years back, I found an article one Facebook discussing why several Muslim students chose to attend the University of Notre Dame, a major Catholic campus. Among the reasons was that a religious campus understood religious observations that can include clothing and dietary restrictions.