And the good cause is to tell everyone how good they are! 

I have no objection to them spending their own money to advance their worldview via their sign campaigns:

No God? …No Problem!

Be good for goodness’ sake.

Humanism is the ideas that you can be good without a belief in God.

I just see some inconsistencies.  What is their standard for good?  No lawgiver = no laws. 

And their premise is made of straw.  As Christians we know why they can do “good” — God’s moral laws are written on their heart.  You can do good by their definition even if you suppress the truth about God in unrighteousness.  I know lots of “good” atheists (by their definition, not God’s). 

Telling others how good you are probably isn’t one of those acts that goes in the “good” column.

According to an April 14, 2008 AD Barna study entitled, “New Study Shows Trends in Tithing and Donating”; in 2007 AD evangelicals Christians (one of three subgroups of Christians under consideration) donated a mean of $4,260 to all non-profit entities while atheists and agnostics provided an average of $467.

According to an April 25, 2005 AD Barna study entitled, “Americans Donate Billions to Charity, But Giving to Churches Has Declined”;

“In 2004…Barna’s national study found that the people least likely to donate any money at all were…atheists and agnostics…A quarter or more…failed to give away any money in 2004.”

Keep donating money for billboards and bus ads. We will feed, clothe and house the poor.

I know that some of the money donated by Christians goes to their churches, so one could claim that they benefit.  But the gaps there are huge.  And they get bigger when you compare Bible-believing Christians to others who check the Christian box.