Here's why this might be the case:
* Brand Loyalty: Some people are incredibly passionate about their car brands, particularly those associated with American muscle cars like Chevrolet. This passion can be expressed in a way that *feels* like religious devotion, with people forming communities around the brand and sharing their love of Chevy vehicles.
* Humorous Hyperbole: People often use exaggerated language for humor. Someone might jokingly say "I worship at the altar of Chevy" to express their extreme fondness for the brand.
* Misunderstanding: It's possible you heard someone say something about Chevy and misheard or misinterpreted it.
In short: "Chevy religion" isn't a real religion, but it might be a playful expression of extreme brand loyalty or a misunderstanding.