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"Man vs. Wild" star Bear Grylls said writing about Jesus was the "hardest thing" he’s ever done, tougher than climbing Mount Everest or sailing a frozen sea, he told Fox News .

"It's been the hardest thing I've ever done, but also the best thing I have ever done," Grylls told " My View with Lara Trump ." "My faith has always been like a quiet, empowering presence through so many adventures."

The U.K.-born survival expert’s book " The Greatest Story Ever Told: An Eyewitness Account ," which was released in June, chronicles the life of Jesus into what he described as a punchy, faith-filled thriller.

BEAR GRYLLS JOINS STEVE DOOCY ON MORNING WALK IN NASHVILLE

"The real story of Jesus is so mind-blowing. It's a story of

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