A wonderful effort by the United States Conference of Catholic Bishops, this letter was signed by Catholic, Sikh, Jewish, Mormon, Eastern Orthodox, evangelical, and Pentecostal communities:
Marriage is the permanent and faithful union of one man and one woman. As such, marriage is the natural basis of the family. Marriage is an institution fundamental to the well-being of all of society, not just religious communities.www.usccb.org
As religious leaders across different faith communities, we join together and affirm our shared commitment to promote and protect marriage as the union of one man and one woman. We honor the unique love between husbands and wives; the indispensible place of fathers and mothers; and the corresponding rights and dignity of all children.
Marriage thus defined is a great good in itself, and it also serves the good of others and society in innumerable ways. The preservation of the unique meaning of marriage is not a special or limited interest but serves the good of all. Therefore, we invite and encourage all people, both within and beyond our faith communities, to stand with us in promoting and protecting marriage as the union of one man and one woman.