A new argument against faith, called the "Coin in the Field" argument, by David Smalley.
This was first published in the paperback copy of Baptized Atheist in 2010, and later revised in the audiobook version released in 2012, and ultimately refined here, as it's first official proposition as a new argument against faith.
Suppose I took you and 30 friends to a field, and told you all: "Somewhere in this field, there is an ancient gold coin worth millions. All you have to do is find it, and it's yours." Immediately, everyone begins looking.
Hours pass. Some of you become weary and tired, and un-trusting. Eventually, a brave one in the group stands up to me and says "We've been looking for hours, and still nothing. I don't think there's a coin in this field."
My response is, "Well, obviously you're not looking properly. Once you find it, you'll know."
After a few days, another brave one stands up to me: "Prove to us there is a coin in this field."
My response is, "To make the assertion that there is no coin, you must prove there isn't one. Do you have all knowledge of this field, and have you inspected every inch of it's land? Then who are you to start your own belief of there being no coin? Why do you hate coins so much? Why are you against people finding wealth?" I then announce to the group, "Ladies and Gentlemen, I'm not sure this person can be trusted."
As the weeks pass, people quietly approach me with various arguments concerning the truth of my coin, as to not bring attention to themselves. I simply encourage them to have faith.
I say things like; "The truth is, there is a coin for each of you. But those who do not find a coin will suffer immense punishment in 20 years. Are you willing to take that chance? It's better to just keep looking."
I begin to offer guidance for finding the coin, so people listen very closely. This in turn, leads people to ask me for guidance on other issues.
Finances, marriage, morality, equality, etc. all become part of my specialities in counseling, as I take donations for my services. Pay taxes on it? Of course not! I'm not doing this for profit, I'm here to help you find the coin.
The atheists are the ones who go home first.
The atheist activists are the ones who go home, get water for everyone else, and come back with a bullhorn and a metal detector.