Your first sentence made no sense. Of course the question had to be opened.
Here's the main problem with all your arguments against same sex marriage. They basically boil down to two arguments.
1) My Imaginary Fairy in the Sky thinks it's wrong.
2) I think it's icky when two dudes do it. (And usually, the person will prove how icky it is by describing in in lurid detail you'd normally find in gay slash fiction.)
Beyond that, if you aren't gay, it really has no effect on your life one way or the other.