Excellent post.
When we let the culteral Marxists throw out the tradition of marriage that has served our society for generations, we have destroyed one more thing: the idea that there is universal truth derived from natural law. Natural law has protected the individual from the collective. It is the basis of our Constitution.
The Cultural Marxists are destroying America from within. Same sex marriage is one more tactic from the Marxist tool box. It has become ingrained into the mindset of the Left to use their freedom of speech to indoctrinate their fellow citizens to what they want them to believe and limit the freedom of speech that says otherwise. The freedoms enjoyed by generations of Americans have degenerated into a tyranny that scorns America’s legacy of freedom to pave the way for the political oppression of the individual. We are becoming an Oligarchy where a small group control America. This collective social model that opposes our Constitutional heritage is the way of the Marxist. Homo marriage has deeper implications than you can imagine. It is designed to control the individual by separating him from the sovereignty of the family. Pretty soon, when all the widgets that hold together our society have been loosened, the critical mass will have been reached and we will explode into the universe of history. Human beings will once again be set back in time to when the individual was the slave of the state.
That is the secular explanation of what Marxism has been doing, but you have to address the religious aspect. People want to have a religious reason for existence or a higher purpose.