So I asked the question of how the 'gay marriage' movement prevents a man and woman from getting married.
I find your logic a bit hard to follow here. First, you state a fact, "people are against 'gay marriage' is because it threatens the institution of the marriage between a man and a woman."
Then you make make a leap to the question of, "how the 'gay marriage' movement prevents a man and woman from getting married."
"Prevention" is not a prerequisite to "threaten".
Non sequitur extraordinaire.
I am asking reasons for a person's position on something in a calm, polite manner and no one seems to want to answer my question. How else besides divorse, child support laws, feminism and cheating on their sponse, can the institution of marraige be threatened between a man and woman than to be prevented from them getting married.