Yes, Steph. M. is a Mormon.

Yes, according to the book of Mormon, Mormons are supposed to view homosexuality as a sin.

Homosexuality in the Book of Mormon:

2 Nephi

1. Homosexuality (the sin of Sodom) is evil. 13:9

SM, however, isn't really a devout Mormon. She's more of a Mormon only in name. I have a few friends of the faith and they all agree that writing something like a lustful vampire romance would contradict many of their beliefs.

So she is a Mormon, but she really isn't.

I have no idea what her stance is on gays; I doubt she's disclosed it to anybody. There is a chance she might be anti-gay (there certainly aren't any homosexual characters, "true love" appears only between straight couples, etc), but judging from Twilight, SM doesn't seem to be a religious fanatic.

Don't forget that it was the Mormon church that bankrolled the campaign against Prop8 (gay marriage in California).

So, the Mormon church is one of the most vocal opponents against gay marriage, but we're not sure if SM actually believes in that stuff because, let's face it, if they made Breaking Dawn into a movie it would probably be against her religion to go see it =)

I find it doubtful that she would be against rights for homosexual people.