Eighteen children filed into a small church one evening last week to learn about the principles of American liberty—including lessons on the failures of communism, the Constitution’s biblical roots and gold’s superiority to government currency, USA Today reports. During the five-day Vacation Liberty School, talks, skits and activities mixed conservative values and early American history, including stories about how colonists’ prayers once helped turn back a threatening French fleet and the principle of equal opportunity, but not necessarily equal results…