What is religion?

Have you ever tried to define what religion is?  This video gives a hint at the immense difficulty of defining what should considered religion?

BTW, this video was extremely easy to make.  I already had the PowerPoint created from a class I teach. The PowerPoint is simply used as a conversation starter on the first day of class to get students thinking about what is religion.  Played out in class, this can make a very interactive lecture.  Students often times debate intensely if some of the “secular” examples I gave are religious or non-religious.  I asked once if they could think of any other celebrities whose fans followed them, “worshiped” them, in a religious way, and someone pointed to a female student in the class and shouted, “Justin Bieber!”  And I saw that her laptop had several Bieber stickers on it and I made that comment, and the person sitting next to her said, “You think that’s religious, look at her wallpaper.”  The student shrugged and said, “Yea, I admit it; I’m a Bielieber.”

I hope you liked the video and I’d love to read how you would define the word, “religion”.