Constitutionally speaking, church and state are entirely separate entities. As such, decisions of one should logically bear absolutely no impact upon the other.
Legal partnership between human beings (& related benefits of such) are civil matters, and therefore issues of state.
The issue of “marriage equality” is a legal matter relating merely to recognition of rights and privileges granted to human couples of any given cultural affiliation, gender combination, etc.
In consideration of all points stated above, civil unions between consenting adults should surely be considered a basic human right under the Constitution, thereby easily accepted and recognised as lawful.
Whether or not any such union should be scrutinised as a matter of religious contention is therefore irrelevant.
Affairs relating to ceremonial blessings, matrimonial services, or any similar ritual observances (and provision of such for ANY couple) should solely be addressed as private matters of spirituality/personal preference to be considered or negotiated exclusively between committed parties and corresponding clerical emissaries.
Cultural traditions aside, legal recognition of partnership is a civil issue – a basic right to which every living being should be entitled to embrace or dismiss at their own discretion.