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Punk's increasingly mad savior character from Straight Edge Society and The Nexus has a lot of creepy religious undertones; real-life Punk is notoriously anti-religious. His response to Teddy Hart saying God made him able to jump off a thirty foot cage?
"There is no god, and that cage wasn't thirty feet."
Which itself was a nod taken Up to Eleven at a line Punk said in the promo that turned him heel and started the original Summer of Punk.
Alternatively, it could be a Development Gag alluding to when he got his head shaved by Rey Mysterio. Punk's original concept for the mask (before Vince McMahon made him change it), included devil horns.
Also, he's a fan of many aspects of pop culture, as he often quotes other media. A good example would be him comparing Laurinaitis to Lumbergh from Office Space without any of the comedy and blasting Lauranitis for being so out of touch.
What Could Have Been: When WWE creative approached him with the idea of having a security force stable centered around him, they suggested Daniel Bryan, The Big Show, and one call-up from developmental (most likely Seth Rollins). He had an idea instead for the stable to be all developmental call-ups, specifically featuring Rollins along with Dean Ambrose and Chris Hero. They liked the idea, but rejected Hero, so we got Roman Reigns instead and Punk wasn't directly involved with the end product of The Shield.