The Bible and God disagrees with Gay Marriage

I will clarify that I do agree with the bible and the trinity. So I am a Christian. I do believe that not only is being gay not a sin, but gay marriage is not a sin either. Anyways, I shall start by saying that Genesis never has the word marriage in it during the story of Adam and Eve. You see Man and Wife, but that can apply to any form of event that's similar to marriage. Unless you can find a verse that says "And God made marriage for man and woman only" then you are rolling snake eyes in this case. Note that the bible mentions 6 days of creation. Let me point out that my opponent believes God is infinite and all capable of doing. So am I. So with that said in mind, Why would it take 6 days to create the earth when God is currently continuing to build the universe, hear our prayers, answer our prayers, communicate with people, and create miracles on earth in one day? I tell you that the Earth either took time to form or it appeared instantly. Before Adam and Eve, days and nights didn't exist, neither did time. Now this is reasonable common sense. I will use sources for my other claims however. Marriage meant many things back then. I heard in a documentary where a Rabbi was discussing the topic, he said back then, marriage was a man going to any woman he liked, putting a ring on her finger and he had the right to marry her and she had no right to reject him. So marriage was very sexist back then. Also, many definitions of marriage have changed and I will leave the source to show you those different kinds. But allow me to state a pattern. Marriage doesn't stay the same in the bible. It evolves. (1) My opponent says that he believes God intended reproduction for male and female. Of course I agree because that's how it happens. Does he think that gay people are idiots who are trying to reproduce but won't admit they can't reproduce? They aren't. It's just sex. I agree with humans marrying in such a way because reproduction doesn't have anything to do with marriage. You could reproduce when your not married. Abraham had sex with his wife's slave. Marriage is just the status of official partners for life. The partner names were later given. Husband and wife. Wife was a name that originated from Germany, while Husband is originated from Old English, Middle English and Old Norse. (Taken from Wikipedia which also has sources on the site. Just type in "husband" or "wife". ) The term husband refers to Middle English huseband, from Old English h$3;sb!3;nda, from Old Norse h$3;sb!3;ndi (h$3;s, "house" b!3;ndi, b$3;andi, present participle of b$3;a, "to dwell", so, etymologically, "a householder"). The word is of Germanic origin, from Proto-Germanic *wībam, "woman". In Middle English it had the form wif, and in Old English wīf, "woman or wife". It is related to Modern German Weib (woman, female), (ends here) Now also note that we are not going to be using much common sense here (well at least I won't. ) Common sense had a lot of meanings. Back then, common sense was that the earth is flat and that the bible said that. Today, not only can we find where the bible says the earth is a sphere, but we can actually use science to physically observe the Earth. So for this case, we must use science if we are to learn about what exactly a gay person is and we must use history if we are to learn about what these cultures and times where like in the bible. Thank you and I look forward to a good debate. :3