Lyric discussion by kfinguerra 

Cover art for Sinner lyrics by Judas Priest

The song seems to be about Aliester crowley

He called himself "the beast"

One of his main objectives was to get us destroy the idea of sin. To "sin all you want" cuz in the end, sin is just a restrictive idea. He rallied against the christian idea of sin as much as any other of his pet notions top destroy (he felt himself on a mission to rid the world of christianty)

"Sacrifice to Vice" is such a cool line, one that uncle al would have truly dug.

He intentionally tried to be the sinner to top them all.

HOWEVER, the most clear clue is in the lyric "30 years now sleeping"....

Crowley died in 1947, and sin after sin was released in 1977. 30 years..

I dont usually find priest to have many crowleyan references, but this one is a sure thing.

If you read and know crowley, the song is almost an anthem of what the man was about.

My Interpretation