Let me tell you, nothing gets my blood boiling faster that a debate on gay marriage. I have a husband of the male persuasion, but the very thought that we let a single religious belief dictate the rights of American citizens just infuriates me more than I can say.
Some might say that my last statement is incorrect, that it is morality that fuels their fight, but that is misleading and not even a good cover. The fact is, if you sat these people down in a court of law, and interrogated them about this statement of beliefs, you would find the Bible at the root of it. There is no other place that teaches this kind of hatred and intolerance. It is not the Government's place to decide our morals for us. Laws are created to ensure the people are protected, and allowing GLBT (Gay, Lesbian, Bisexual, and Transgendered) individuals the right to marry, so they can enjoy the same rights as married individuals, does not infringe on the rights of straight population.
Last I checked, (To quote Wikipedia) the First Amendment to the United States Constitution is the part of the United States Bill of Rights that expressly prohibits the United States Congress from making laws "respecting an establishment of religion" or that prohibit the free exercise of religion, laws that infringe the freedom of speech, infringe the freedom of the press, limit the right to peaceably assemble, or limit the right to petition the government for a redress of grievances.
Now that statement does not specifically say "Seperation of Church and State," but it does say that no laws can be passed respecting any one specific religion. Despite this amendment, we have continued to deny the basic right of civil union (or marriage, whatever you call it) to GLBT Americans.
There is more evidence supporting that being born gay is more likely than being "turned." See the article regarding scientists study of the fruit fly for more information on this. This puritan mentality has done nothing for how the rest of the world views us except to show how hypocritical we really are.