FFRF Crank Mail

In each issue of Freethought Today, published by the Freedom From Religion Foundation (FFRF), there is a special section called, "Sharing the Crank Mail."  These are letters that are sent to FFRF by upstanding Christian citizens telling FFRF to turn to God before it's too late!  I mischaracterize, with great charity ... the rudeness and vulgarity expressed by some of these "Christians" is well, rather "Un-Christian."