I was just thinking of this story over lunch and I wonder why the priest doesn't just claim Satan put the images there, or at least an operative of Satan? The church still does exorcisms and believes that Satan can be an operative in this world, how could this be less defensible or less crazy?
This also gives the church plausible deniability and further fire cover for their priests behaving badly. Attribute miracles to invisible forces, attribute embarrassing faux pas to invisible forces. It's at least logically consistent.