Our church's evolving attitude has led us to the point where we must consider gay marriage

Here is a snippet from a great editorial by Bp. Chane:

Christians have always argued about marriage. Jesus criticised the Mosaic law on divorce, saying "What God has joined together let no man separate", but even that dictum appears in different versions in the Gospels, and was modified in the letters of Peter and Paul. Christians had to square the ecstatic sensuality of the Song of Songs with Paul's teaching that marriage was a fallen estate, useful primarily in saving those who could not be celibate from fornication.

This tension is indicative of the church's long struggle to reconcile the notion that sexuality is a gift from God with its deep suspicion of the pleasure of sex. As the historian Stephanie Coontz points out, the church did not bless marriages until the third century, or define marriage as a sacrament until 1215.

You can find the entire article here.