perspective. In December 2009, Washington, D.C. Mayor Adrian Fenty signed the bill to legalize same-sex marriage for the District of Columbia in All Souls Church, Unitarian (Washington, D.C.) Unitarian Universalists for Polyamory Awareness engages Unitarian Universalist ministers and other leaders to educate them on polyamory. At the 2015 UUA General Assembly, the Association's non-discrimination rule was amended to include the category of "family and relationship structures"; the UUA has yet to take specific follow-up action on this, however. Many congregations are heavily involved in projects and efforts aimed at supporting environmental causes and sustainability. These are often termed "seventh principle" activities because of the seventh principle quoted above. Controversies External Lack of formal creed The lack of formal creed has been a cause for criticism among some who argue that Unitarian Universalism is thus without religious content. In May 2004, Texas Comptroller Carole Keeton Strayhorn ruled that Unitarian Universalism was not a "religion" because it "does not have one system of belief", and stripped the Red River Unitarian Universalist Church in Denison, Texas, of its tax-exempt status. However, within weeks, Strayhorn reversed her decision. Confusion with other groups There are separate movements and organizations who hold to classical Unitarian or Christian universalist Christian theology and neither belong to the Unitarian Universalist Association nor consider themselves Unitarian Universalists. The American Unitarian Conference and the Christian Universalist Association are the two most significant organizations representing these theological beliefs today. Christians who hold these beliefs tend to consider themselves the true Unitarians or Universalists and heirs of the theological legacy of the original American Unitarian Association or Universalist Church of America, and they do not wish to be confused with Unitarian Universalists. The Unity Church is another denomination that is often confused with Unitarian Universalism. Boy Scouts of America In 1992, the UUA published statements opposing the BSA's policies of discriminating against homosexuals, atheists, and agnostics; and in 1993, the UUA updated the curriculum guidance of its "Religion in Life" emblems program for young people in scouting to include criticism of the BSA policies. On account of the published criticism, in 1998 the BSA withdrew its recognition of UUA's Religion in Life emblem program. Subsequently, the UUA removed the objectionable material from the program curriculum and the BSA renewed recognition of the Religion in Life program. Later, the UUA issued internal, supplemental material to emblems-program workbooks that included general statements critical of discrimination