So reports a prominent Turkish newspaper (thanks to Ed Grinberg for the pointer):
Baruter’s caricature depicted an imam and believers praying in a mosque. One of the characters is talking to God on his cellphone and asking to be pardoned from the last part of the prayer because he has errands to run.
Within the wall decorations of the mosque, Baruter hid the words, “There is no Allah, religion is a lie.” The cartoon was published in the weekly “Penguen” humor magazine.
The cartoon is available at the linked-to site; I would have included it, but its message isn’t understandable to people who don’t know Turkish.