Whoa, this is getting heated.
About stem cell research: It's been awhile since I researched it, but I believe there's more than one way to 'research' stem cells. If I remember correctly, stem cells can also be found in bones (as they make blood cells) and apparently other parts of the body. Sounds morally sound to me, and whatever your stand on killing fetuses is, you need to be quite the hippy to be against studying bones.
About abortion: I'm not for or against the morals of it. You could argue life starts when a sperm cell is made (says the guy who never masturbates), when it touches an egg, or at a phase in a fetuses development.
However, I am against abortion as a whole. If you don't want kids, you shouldn't screw around. (the movie 'Idiocracy' comes to mind).
About gay marriage: Like I care whether you like the same love or not. We all deserve the same rights, and for the most part, we have them.
However, I would be against a gay couple marching into a church demanding a ceremonial marriage, where if the minister/pasture/whatever refuses, he loses his/her job (first amendment and separation of church and state comes to mind). I'm not saying this has happened, but I have a bad feeling it may in the near future.
Hating gays needs to end, hell, hating anyone needs to end (course it never will but...)
Edit: Underlined cerimonial. Marriage legally should be allowed to all people. I'm talking about marriage in definition of a religion. A gay couple can be married, that's fine, I'm only against them walking into a church and ordering the church to turn their beliefs around, that is if it forbids gay marriage.
So there's my viewpoints. Flame away, I probably won't be back here in awhile.