A Praying Mantis Praying in Church?

As you can see, a praying mantis (perhaps Mantis religiosa and perhaps male since he looks brown in the photo; the females are green) decided to alight on the reredos and our sacristan managed to actually get a photo.

I don't know if our visitor brought good fortune or not; I vaguely remember my grandmother telling us it was very bad luck to kill one, even by accident.