A case that is "currently before the United States District Court, Eastern District of Kentucky":

On December 12, 2012, American Atheists and two co-plaintiffs filed a lawsuit in U.S. District Court in the Eastern District of Kentucky demanding that the Internal Revenue Service (IRS) stop giving preferential treatment to churches and religious organizations via the process of receiving non-profit tax-exempt status under the Internal Revue Code (IRC) procedures and definitions.IRS

Groups like American Atheists receive tax-exempt status under Internal Revenue Code 501(c)(3) but, because the organization is not classified as religious, it costs American Atheists and other secular non-profits significantly more money each year to maintain that status. In this lawsuit, American atheists and the other plaintiffs are demanding that all tax-exempt organizations, including those characterized as religious by the IRS, have the same requirements to achieve and maintain tax-exempt status.

Christians, before you moan and groan about the war on this and that, recall the words of your very own master: “Give to Caesar what is Caesar's, and to God what is God's.” And what does God want? Nothing that's under the sun.