Doug Stanhope
Doug Stanhopes genius as a comedian and ability to cause uncontrolable laughter is enough to convince most that he is a Ninja. Others may say that his love for free speech, alcohol, drugs and vulgarity filled rants are what convinced them. You top that off with his admitance that he is an agnostic, and it is hard to decline that he is one of Crustianity's most recognized Ninjas. Very few other comedians have the ability to dismantle religion as Stanhope does.
More information about Doug Stanhope can be found at the sites below.
Doug Stanhope at Wikipedia