I have been part of discussion over same gender relationships and marriage equality for a number of years. Below are two articles.
Sexuality in the Light of Christ is a publication that we make available at the church.
Asking the Right Questions was a longer piece I wrote as part of an inter-church dialogue on the issue.
I have observed over the years, since I was at University that the arguments have migrated regularly. Some of what I wrote is thus dated, but the Biblical portions remain my view of the texts in question.
Finally, Biblical passages that pertain to Sexuality.