Meme was coined by Richard Dawkins in The Selfish Gene in 1976, and defined as the equivalent of a gene but for more abstract ideas (because the gene is ultimately just a unit of information as well). I don't remember for sure if religion is specifically an example he personally used, but if it's not it's very comfortably in the same vein.
Fonts
I always use Windows fonts with Linux. What font do you use?
Which internet meme, if somehow erased from ever emerging, might have the biggest impact?
Is there a fundamental internet meme that has had such a major impact that it would have notable repercussions if it had somehow disappeared?