Why Does God Have So Many Billboards?

Jay Stoltzfus, the administrative assistant of Christian Aid Ministries’ Billboard Evangelism program, seems to agree that most religious billboards are local efforts.

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The Freedom from Religion Foundation posts billboards with slogans like “Sleep in on Sundays” and quotes from atheists and humanists.  
http://priceonomics.com/why-does-god-have-so-many-billboards/