I thought this OP was a play on words for the pedos in the congregations. "Prey" in US English means the natural practice or habit of predatory animals of hunting, killing, and eating other animals. If it means something else in the Queen's English, mea culpa/ignore.
"Pray" means to entreat, implore —often used as a function word in introducing a question, request, or plea to a god.
It's a whole lot funnier with the first thought.