I heard a very interesting debate about the origins of this saying, no one knows it's true origin it's not biblical but it has biblical connotations (if this story is to be believed)
It's a derivation of Christ on the Cross,
( Chri St on(e) the Cro(w)s s )an expletive like Gor Blimey (God Blind Me).
Dunno if it's true. But I like it