With episcopal approval from Bishop Tadros of Port Said and Bishop Yuhanna of Cairo, "Sallman's Head of Christ was exhibited in the Coptic Church", with "more than fifty thousand people" visiting the church to see it. In addition, several religious magazines have explained the "power of Sallman's picture" by documenting occurrences such as headhunters letting go of a businessman and fleeing after seeing the image, a "thief who aborted his misdeed when he saw the Head of Christ on a living room wall", and deathbed conversions of non-believers to Christianity. As an extraordinarily successful work of Christian popular devotional art, it had been reproduced over half a billion times worldwide by the end of the 20th century.
