That's your narrow take on the meaning of marriage and the act of love. Fortunately we are protected by the separation of church and state in this country.

As a child (one of 4) who was adopted by an unstable couple who never should have been married, let alone parents, I know I am missing the emotions, the empathy, the tools and the desire to parent children. I spent my entire childhood being reminded of how much a burden I was, and that my parents only adopted us because they felt pressured to do so (oh, and there was a substantial financial encouragement package with each adoption.
I left my parents' home the morning of the day I turned 16 and never looked back. My partner and I have a very fulfilling life and there is no part of me that says "What if....?"