For generations, young Christians have learned how to hold and respect their Bibles during competitions known as "Sword drills."

The sword image comes from a New Testament affirmation that the "word of God is … sharper than any two-edged sword."

Drill leaders say, "Attention!" Competitors stand straight, hands at their sides.

"Draw swords!" They raise their Bibles to waist level, hands flat on the front and back covers. The leader challenges participants to find a specific passage or a hero or theme in scripture.

"Charge!" Competitors have 20 seconds to complete their task and step forward. For some, four or five seconds will be enough.

The key is knowing how to open the Bible, as well as hold it.

It's safe to say the young Donald Trump didn't take part in many Bible drills while preparing to be confirmed, at age 13 or thereabouts, as a Presbyterian in Queens, New York City. His mother gave him a Revised Standard Version -- embraced by mainline Protestants, shunned by evangelicals -- several years earlier.

President Trump was holding a Revised Standard Version during his iconic visit to the historic St. John's Episcopal Church, after police and security personnel drove protesters from Lafayette Square, next to the White House. To this day, evangelicals favor other Bible translations, while liberal Protestants have embraced the more gender-neutral New Revised Standard Version.

A reporter asked: "Is that your Bible?"

The president responded: "It's a Bible."

"Trump is a mainline Protestant. That's what is in his bones -- not evangelicalism. It's clear that he's not at home with evangelicals. That's not his culture, unless he's talking about politics," said historian Thomas S. Kidd of Baylor University, author of "Who Is an Evangelical? The History of a Movement in Crisis."