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Jesus could have been an antique meme à la Chuck Norris that got waaaay out of hand
(sh.itjust.works)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
The first person to coin the word meme was Richard Dawkins in his book 'the selfish gene'. He also postulates in the same chapter that religion is a particular form of a meme. So you're one hundred percent correct!