If you're asking if there are religions that are not against same-sex marriage: Yes.
Off-hand, the Unitarian church comes to mind, and I know that among many Christian denominations there are individuals or entire congregations that support same-sex marriage.
A quick check on Wiki says:
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The United Church of Christ and the Alliance of Baptists also condone gay marriage, and some parts of the Anglican and Lutheran churches allow for the blessing of gay unions.
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Satanism, in the LaVey tradition, is open to all forms of sexual expression, and does not preclude homosexuality.
Full article on Wikipedia
here