LANE: Yeah, yeah, Dave. Christians can still rock, don’t hide it.
ZACH: Marshall stacks don’t know Christians from atheists.
DAVE: Gosh, I just wasn’t sure if you guys would be accepting of my devoutness.
Marshall, British company that designs and manufactures music amplifiers, speakers, headphones and earphones, drums and bongos. The company also owns a record label called Marshall Records. It was founded in London in 1962 by drum shop owner and drummer, Jim Marshall, and is now based in Milton Keynes, England.
Their amplifiers are known as Marshall stacks, due to their size. Iconic in rock and roll, famous customers of Marshall include The Who, Eric Clapton, Jimi Hendrix, and John Mayall.
When Zach and Brian realise that Dave has been moonlighting as a Christian guitarist for Lane’s mother, they comically miss the point, and decide that Dave has been hiding a secret from them – that he’s a devout Christian. They immediately assure Dave that his religion makes no difference to how they feel about him, and he had no reason to hide it from them.
The Annotated Gilmore Girls 