Methodist Evangelicals Together (MET) has issued a response after the Church announced plans to consider allowing same sex weddings in its buildings.
The plans will be voted at its annual conference next month and again next year.
If passed all Methodist churches would be permitted to host the ceremonies but any minister could opt out.
In statement in response to the Marriage and Relationships Task Group report, a MET spokesperson said: [We are] committed to the Wesleyan convictions that the gospel is for all, that the Bible is our supreme rule of faith and practice, and that all Christians are called to holiness.
"We therefore uphold the biblical understanding of marriage as the life-long union of one man and one woman, and call upon the Church to do the same.
"We are carefully studying the report, noting that it is intended as a discussion starter rather than reaching definitive conclusions."
Speaking to Premier last week, Rev Ken Howcroft who chairs the Marriage and Relationships Task Group said: "Whatever we say, there will be people who profoundly disagree with that and that's the journey we've been on for all these years - in particular for the last 25 years or so.
"What we're trying to do is to find a way in which we can deeply honour each other's convictions."
The Methodist Conference meets in Birmingham between 27th June and 4th July.
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