Which religions do not accept same-sex marriage?

As of 2013, many, including:

Adventist

African Methodist Episcopal Zion Church/African Methodist Episcopal Church

American Baptist

Assemblies of God

Southern Baptist Convention[67]

Calvary Chapel

Canadian and American Reformed Churches

Christian Reformed Church in North America[11]

Reformed Church in America

Churches of Christ

Church of the Nazarene[69]

Church of Scotland

Eastern Orthodox

Oriental Orthodox

Jehovah's Witnesses

The Church of Jesus Christ of Latter-day Saints (Mormons)

Lutheran Church Missouri Synod[73]

German Lutheran and United Churches inEvangelical Church in Germany

Mennonite

United Methodist Church

Moravian Church

New Apostolic

Old Order Amish

Assemblies of God[37]

Church of God (Anderson, Indiana)

Church of God (Cleveland, Tennessee)[36]

Protestant Church in the Netherlands

United Pentecostal Church International[76]

Evangelical Presbyterian Church[48]

Orthodox Presbyterian Church[50]

Presbyterian Church (USA)

Presbyterian Church in America

Roman Catholic Church

Old Catholic

Swiss Reformed Churches in Federation of Swiss Protestant Churches

Unification Church

Vineyard USA

Rosicrucian Fellowship(Esoteric Christians)

Orthodox Judaism