Lesbian, gay, bisexual, and transgender (LGBT) affirming religious groups (also called gay-affirming) are religious groups that welcome LGBT members and do not consider homosexuality to be a sin. They include entire religious denominations, as well as individual churches and synagogues. Some are composed mainly of non-LGBT members and also have specific programs to welcome LGBT people, while others are composed mainly of LGBT members.
The Abrahamic religions of Judaism, Christianity and Islam, have traditionally forbidden non-heterosexual and non-vaginal sexual intercourse (both of which have been variously labeled as sodomy), believing and teaching that such behavior is sinful and derived from the behavior of the residents of Sodom and Gomorrah. Today, several denominations within Christianity and Judaism accept gay, lesbian, bisexual, and transgender members and permit the ordination of openly LGBT candidates for ministry. Examples are the Reform, Conservative and Reconstructionist movements in Judaism, the United Church of Christ, United Church of Canada, Episcopal Church in the United States, Evangelical Lutheran Church in America, the Presbyterian Church (USA), Community of Christ, and the Metropolitan Community Church. Some of these traditions have made provision for same-sex unions or marriage. In Europe, a number of Lutheran, Reformed, United and Old Catholic churches have adopted increasingly accepting policies towards LGBT members.