One of the arguments that the Anglican Church of Canada uses for same-sex marriage is that a homosexual relationship can demonstrate the love that is found in the Trinity:
In the divine economy God is understood as Trinity: Father, Son and Holy Spirit living in an eternal and divine relationship of love. Humankind is created in the image and likeness of God to live in relationship. The relationship is to love God, and to love others as God loves humanity. Marriage is to be an image of Trinitarian relationship and in the way God, in Christ Jesus, loves the Church.
A newer trend is “triad marriages”: 3 people marrying:
If you can think of a committed loving relationship that includes more than one person, then you’ve got a decent grasp of the concept. It’s not a casual escapade; the work needed to be in an honest, growing, healthy relationship rises exponentially when you increase to more than a standard couple. Thus, poly people are often very seriously committed to personal honesty, relationship integrity, and trust.
If the ACoC really takes its argument on the Trinity and same-sex marriage seriously, how much more so should it for triad marriages: after all, they have even more potential to demonstrate the love between the Trinity.
Coming next to an Anglican Church close to you: the marriage of those in committed long-term triad relationships.
Anglican Samizdat 
Believe it or not, this is already finding some support, albeit on the fringe. But of course yesterday’s fringe is today’s mainstream practice:
http://www.libchrist.com/bible/polygamy.html
Somebody brought the following up on another messageboard, and I managed to find it again via Google:
http://www.robgagnon.net/AARGayMen%27sGroup.htm edited to make link work – David
Scroll down to the headline: “Trinitarian Tango: Divine Perichoretic Fecundity in Polyamorous Relations”. No, it’s not a spoof.
Comment by Ellie M. — May 12, 2009 @ 10:31 am
Are they saying that fathers should now be free to marry their sons? Or are they just bring in the Trinity to lend an air of legitimacy or authority to their nonsense? The whole Rothesay report is so full of leaps of logic, non sequiturs and just plain head-scratchers that one can only ask in wonder, “What are you people thinking???”
Comment by John K — May 12, 2009 @ 10:34 am