Why is The Beatles' "Revolver" the Vatican's idea of the best record album of all time?

Because of the priest and the church in "Eleanor Rigby"? No. Looking at what else they came up with...

Pink Floyd’s The Dark Side of The Moon, Oasis’ (What’s the Story) Morning Glory?, and Michael Jackson’s Thriller, whose “illuminating simplicity and musical thrust” they hail. Also: U2’s Achtung Baby, Fleetwood Mac’s Rumours, Donald Fagen of Steely Dan fame’s The Nightfly, Carlos Santana’s Supernatural, Paul Simon’s Graceland and David Crosby’s If I Could Only Remember My Name.

... I'm guessing they're just Baby Boomers like me.

There's no Bob Dylan though. He's okay himself, but he "harshly tested the ears and patience of listeners with their inferior imitations, thinking that their tortured meanderings might interest somebody." Ha ha. Religious opinions.