I am no fan of the LDS (for very clear reasons), however people seem to forget that Religious institutions in America are 'PRIVATE' organizations. They can offer whatever they want and refuse whatever they want, within the limits of Constitutional law.
Marriage beyond that of a Man and Woman, is a State issue, not a Religious or Federal issue. The State if compelled by the People by voting will or will not allow Civil Unions of Non-Man & Woman unions. However forcing a Private Organization, just like Forcing a Private Individual to do something against themselves is yet Unconstitutional, since Individual Rights are originally protected and Religious Right also under the 1st Amendment and the 9th Amendment.
A Gay person wouldn't want to be forced to marry a straight person of the opposite sex?
Stop violating the Rights of Religious organizations and focus your efforts on the States. And realize that there are Religious institutions in America and Canada that offer Religious Marriage regardless of what their respective peers decree.
there are over 100 churches in America and Canada (even throughout the World), that offer this, ranging from Lutheran, Pentecostal to whatever (like the Anglican Church of Canada, The Lutheran Church of Sweden, the Church of Denmark, the Mennonite Church in the Netherlands, the Affirming Pentecostal Church International and the Global Alliance of Affirming Apostolic Pentecostals, the Unitarian Universalists, and the Swedenborgian Church of North America, as well as British and Canadian Quakers.). Some may not be under the direct authority of those said institutions (some are), but they still preach from their same respective Holy books, only with a more Christlike attitude.
A moral approach to getting Religion to want what you want is by being selfless, and showing who you are and that you have something to offer the community by how you act. Acting like spoiled brats with Fascist intent is not going to have Religious institutions falling over themselves to come over to your side.
Next time you want something that is a violation of Right, remember what it'd be like if someone tried to violate your Right to do or not do something. Remember that the issue is in the hands of the people and therefore a State issue,; Religious Organizations are not apart of the state and therefor our of this scope of influence.
To express otherwise, shows a severe lack of understanding of Religious and Individual freedoms, as well as What Separation of Church and State really means.
Options are available right now and other options are available with a little leg work within your states.