Lots of churches will happily perform gay marriages.
Lots of people don't get married in churches.
Lots of people are "married" without any ceremony at all (see: http://en.wikipedia....the_United_States )
You're tilting at windmills to think that the term "marriage" needs to be somehow redefined or that it can be done "easily" or that doing so will make everyone "equal".
(Sorry if I reposted info in a crazy link.)
Cheers,
Scott.