The group of churches affiliated with Congregationalism sweep from Conservative to Progressive with no hierarchy of government leaving decisions at the local level. The main group is Protestant - 'United Church of Christ' and does not appear to allow same sex marriage (Pastor Jeremiah Wright of President Obama fame is a member here). See related link for history of Congregationalism:
No it does not permit same sex marriage.
No, Nestorianism does not permit same-sex marriage.
Yes, this church does permit same-sex marriage.
No. This denomination does not permit same-sex couples to marry.
No. They only allow members to marry other members and do not permit same-sex marriage. In fact, they actively lobby against it.
No. This group does not permit same-sex couples to marry, nor does it permit same-sex relationships.
No. This group does not permit same-sex couples to marry, nor does it permit same-sex relationships.
No. This group does not permit same-sex couples to marry, nor does it permit same-sex relationships.
No, they do not.
No, it does not.
No, it does not.
No, this denomination does not permit same-sex couples to marry.