If you don't understand what "marriage between one man and one woman" means, I'm not going to belabor the point with you. You can go to any protestant minister or Catholic Priest and ask them for something to read, a time to talk it over, and you'll probably find someone among them who will have an appointment time for you.
I understand it very well. I'm just saying that marriage is its substance. If you give away the substance, then so what about the word.