Aye, and the article also mentions other possibilities. But I like the suggestion that soothsayers/magicians might have deliberately enhanced their cred by using the engraving to legitimise their supernatural powers - "by invoking the name of Christ"

He was widely known by that time as a master of miracle working apparently. Having a hotline to Jesus and broadcasting his word isn't unknown, even today...

"Pray for our military. Pray for our military men and women who are striving to do what is right for this country - that our leaders, our national leaders are sending them out on a task that is from God"
(Sarah effing Palin)