The ever-changing scope of human thought.
At some point the meaning of the word "Religion" has morphed from it's original "Life under monastic vows" and has been expanded to include vast swaths of differing ideologies.
Most recently, in a similiar turn-around as has previously happened with such words as"faggot" (originally meaning "a bundle of sticks") and "awful"(originally meaning "awe-inspiring") "religion" is swiftly becoming more of a slur (as in: "don't listen to those religious kooks!") than a description of somebody's way of life.
It is in spite of (or perhaps because of) this twisting of language, and shunning the most modern sense of the term, that I leave you with the following meaty morsel of wisdom(or lack-there-of):
Humans are to religion
what Dung beetles are to shit.