"Statistics show that 80 percent will leave their faith by age 23....We felt the call to help in this new means of evangelization."

More than 350 participants from across the country registered for the event.

Those detained, according to the report, were treated with "aggressive and inappropriate conduct" during the ICE raids.

Modern-day religion is becoming stifled in the secular age, said Mary Eberstadt, author of "It's Dangerous to Believe: Religious Freedom and Its Enemies."