MADISON, WI (WTAQ) - The Madison-based Freedom from Religion Foundation is taking the tax man to court.

The atheist and agnostic organization is alleging the Internal Revenue Service is giving unconstitutional preferential treatment to churches and other religious organizations.

The lawsuit was filed in federal court last Thursday.

It argues the IRS is violating the Establishment Clause of the First Amendment, as well as constitutional equal protection rights by exempting churches from having to file a detailed application form, pay a fee and submit information each year to maintain tax-exempt status.