Brian Stelter states the CNN policy here about displaying images of the Muslim prophet:
"Many major news organizations, including CNN, generally refrain from showing images that purport to show the prophet. In recent days, executives at CNN have cited concerns about the safety of staff members and sensitivity towards Muslim audiences, but they have also indicated that the network's decision is subject to change."
"Piss Christ" is shown here at CNN as one of 10 controversial works of art, along with an obscene "The Holy Virgin Mary".
Sensitivity towards Christian audiences obviously counts for little at CNN.
