The phrase “holy crap!” is part of American idiomatic speech. It dates from around 1935, and was first used in a popular comic strip.
Today the U.S. Secretary of Defense explained that the United States needs to continue its mission of blowing up entire buildings filled with little schoolgirls, as well as committing whatever other military atrocities he deems necessary. His justification is that this is a holy war, and that Jesus would approve.
Or maybe he just wants to make sure everybody understands that he is a drooling, grossly amoral, shockingly incompetent idiot, who likes to cosplay as a Christian. I don’t think, until today, I ever truly understood the term “holy crap.”