Holy Roller

noun2

1. •
   (informal, offensive) A member of any Christian church characterized by ecstatic behaviour; especially of the Pentecostal Church.

   • I attended a worship service where I was astounded to see holy rollers convulsing on the floor and speaking in tongues.
2. •
   (informal, offensive) A devoutly religious Christian person.

   • She's such a holy roller that she steers every conversation around to the joys of religion.