According to the FFRF, its lawsuit, filed November 14 in a Madison, Wisconsin, U.S. District Court, "argues that the IRS is not enforcing the federal tax code, which prohibits tax-exempt religious organizations from electioneering." The FFRF insists that the IRS' lack of enforcement "is a violation of the establishment clause of the First Amendment and a violation of equal protection rights because the same preferential treatment is not provided to other tax-exempt organizations" -- such as the FFRF. The group complained that churches and other Christian groups have taken to "blatantly and deliberately flaunting the electioneering restrictions" set up by the IRS back in the 1950s.
MORE: http://www.thenewamerican.com/culture/faith-and-morals/item/13687-atheists-sue-irs-for-failure-to-prosecute-churches-christian-groups
See also...
Atheist group sues over political speech by bishops, churches
http://marquettetribune.org/2012/11/20/news/atheists-atheist-group-sues-over-political-speech-by-bishops-churches-jk1-ab2-ap3/
