The church in the town of Gothem on the Swedish Island of Gotland features this wall painting, which depicts (from left to right) the Pope, St. Christopher, baby Jesus, and Mohammed. According to this scholarly paper (pdf file), "An early example of how Muhammad was used in the early reformation comes from a wall painting in the Gothem church on Gotland (an island situated on the East coast of Sweden) from the middle of the 16th century. The painting depicts St Christopher, Jesus as a child, the Pope and Mohammad. St Christopher caries the child on his shoulder, saving it from the water in which the Pope and Muhammad perish. How do we understand this painting? The propaganda is directed towards Catholicism. The drowning, nameless pope is humiliated by being associated with Muhammad and Islam; the false prophets perish together."
The photos seen here were taken by a Danish photographer and originally posted on a site that is no longer online.
Link.