In his poem “If I Were Tickled By the Rub of Love”, Dylan Thomas refers to “Jack of Christ”:
And what’s the rub? Death’s feather on the nerve?
Your mouth, my love, the thistle in the kiss?
My Jack of Christ born thorny on the tree?
Now, I've heard jack used to mean a man (“every man-jack”, etc.) and Etymonline says it is
Used generically of men (jack-of-all-trades, 1610s), male animals (1620s, see jackass, jackdaw, etc.), and male personifications (1520s, e.g. Jack Frost).
I understand the line to be talking about a representation of Jesus, but I’m trying to get at how common the expression is. If it’s a common substitution for Jesus Christ I think it’s probably less intentionally profane than if Dylan Thomas had coined the usage here to mean just another human being.
Do speakers of British English use “Jack of Christ” as even a rough synonym for Jesus Christ?