I would remind those who cite Scripture as the rationale for their resistance to same-sex marriage to acknowledge the following. Scripture was cited to support prohibitions against the ordination of women, the validation of the enslavement of blacks, support for racial segregation, and resistance to interracial marriage.
Jack the Ripper used a scalpel to murder women in London. Should we not let surgeons use scalpels then?
If the Bible is a means of grace meant to lead us into holiness, then the question is not whether some people have used it to support bad arguments in the past. The only question is “How is the Holy Spirit using scripture right now to lead us into holiness?”