This is false. Gay marriage is shackle to government marriage sanctified by government. It is a worse sharia replacing the former one if there was any.
You are saying the same thing as the author of the article.
Marriage is a covenant between a man and a woman before god, not before government.
Before DOMA, gay marriage was barely an issue. DOMA created the precedent that the definition of marriage should be defined by the government. So if you believe in the legitimacy of DOMA, now you must also believe in the legitimacy of gay marriage. This was their plan from the beginning.
Government should have just stayed out of it. The supporters of DOMA got played by Bill Clinton.