Yeah, this is bizarre. First of all, marry someone who doesn't mind that you believe as you do. Second of all, if he's marrying a guy, he's acting in opposition to the teachings of his church, so to expect you to adhere to the religion he isn't interested in adhering to is ridiculous. Thirdly, you don't live mormon just because your spouse wants you to. It doesn't work like that. Mormonism is highly demanding of its adherents and if you don't honestly believe the doctrine, this will be very difficult. Fourthly, this is just fishy all around. Have you even met the guy?
Oh. I just read the thread. All these questions were answered. Ok. Well good luck.
a) Firstly, unfortunately in this world, LGBT devotees are very scarce, let alone those who are out of the closet. In my organisation, Sri Chaitanya Saraswat Math (SCS Math), many devotees are married with people of different backgrounds or beliefs, so that is not too much of a problem. Plus, this man is already following our regulative principles, which is 1) no meat eating (meat, fish or eggs), 2) no gambling, 3) no intoxication (alcohol, caffeine, or nicotine), 4) no sex outside of marriage, and 5) not accumulating too much wealth.
Hare Krishnas and Mormons have similar social values, it seems. Plus, he doesn't mind me visiting the temple or doing an arti ceremony to Jesus.
2) Because of Boyd Packer's speech in the General Conference on the sickness and abomination of homosexuals, he mustered enough strength to hand in his resignation letter about a week ago. He is still adhering to his belief in restoration Christianity, which does not necessarily mean that he must be attached to the Church of Jesus Christ of Latter-Day Saints to believe. I am not part of ISKCON (the International Society for Krishna Consciousness), but that does not make me any less of a Vaishnava.
The existence of churches outside the LDS Church (Community of Christ, Church of Jesus Christ, Church of Christ (Temple Lot), etc. are a witness that one can still bear testimony to the Book of Mormon, and the prophet Joseph Smith, without the Church of Jesus Christ of Latter-Day Saints.
3) Relationships are constantly about learning to help one another and giving in when necessary. Having read the anti-feminist book "Fascinating Womanhood" which gives self-help for Christians in a traditional homemaking/breadwinning dynamic (and which the writer is also part of the CoJCoLDS), I still can hold onto my Vaishnava principles and able to share in Mormon cultural values as well.
But then again, the Dharmic religions are not 'black and white' as the Abrahamic religions are. Sanatana Dharma, or the eternal religion/duty/occupation/way of life is something that naturally evolves in time, place or circumstance (kaladeshapatra). The core Vedic teachings are the same, but the context in which one applies such values differ according to the culture.
4) I will be meeting him come November. Wish me luck! Besides, all relationships, at least in the traditional Gaudiya Vaishnava sense of the term, should always lead towards a long-term monogamous marriage relationship -- otherwise, such a relationship would only be for sense gratification and not edifying for spiritual life, nor for Krishna Himself (or Elohim, as you call Him). I Skype with him doing Bible studies and whatnot four times a week, plus, chatting every day.