A "religious thriller" is a suspense novel whose plot is closely connected to religious objects, institutions or questions. Here are 30 of my favorites I've enjoyed throughout the years:

Cross bones by Kathy Reichs

Salvation in death by J.D. Robb

Angels & demons by Dan Brown

The Europa conspiracy by Tim LaHaye and Bob Phillips

The last jihad: a novel by Joel C. Rosenberg

The Ezekiel option: a novel by Joel C. Rosenberg

The last days by Joel C. Rosenberg

The copper scroll by Joel C. Rosenberg

The lost symbol: a novel by Dan Brown

The rose labyrinth by Titania Hardie

The grail conspiracy by Lynn Sholes and Joe Moore

The last secret of the temple by Paul Sussman

The third secret: a novel by Steve Berry

Map of bones: a Sigma Force novel by James Rollins

Piercing the darkness by Frank E. Peretti

Excavation by James Rollins

The Da Vinci code: a novel by Dan Brown

Blasphemy by Douglas Preston

Black order by James Rollins

The twelfth Imam by Joel C. Rosenberg

The Templar legacy: a novel of suspense by Steve Berry

The footprints of God by Greg Iles

Kingdom come by Jim Hougan

Labyrinth by Kate Mosse

The Dante Club: a novel by Matthew Pearl

The Mephisto Club: a novel by Tess Gerritsen

The last Templar by Raymond Khoury

The templar salvation by Raymond Khoury

Windswept house: a Vatican novel by Malachi Martin

People of the book by Geraldine Brooks