"So Jehovah God caused the man to fall into a deep sleep, and while he was sleeping, he took one of his ribs and then closed up the flesh over its place. 22 And Jehovah God built the rib that he had taken from the man into a woman, and he brought her to the man. 23 Then the man said: “This is at last bone of my bones And flesh of my flesh. This one will be called Woman, Because from man she was taken.” 24 That is why a man will leave his father and his mother and he will stick to his wife, and they will become one flesh. 25 And both of them continued to be naked, the man and his wife; yet they were not ashamed." (Gen 2:21-25)
That is all the evidence I need. I don't expect that it will mean much to you but you did ask for "biblical evidence".
ING - That doesn't say anything about marriage. Nor does it say two of the same can't come together. Nor is it the actual story - which says they were together - and split into two parts, - not woman made from a rib. You can read about this in Rabbinical literature concerning that text. It isn't "wife" either, - it is "woman."
Since Jesus spoke about the first man and woman, I have no reason to believe that they were fictitious.
ING - The dates prove it fictitious.
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Matthew 19:4-6 "In reply he said: “Have you not read that the one who created them from the beginning made them male and female 5 and said: ‘For this reason a man will leave his father and his mother and will stick to his wife, and the two will be one flesh’? 6 So that they are no longer two, but one flesh. Therefore, what God has yoked together, let no man put apart.”
I believe that these words still form part of some people's marriage vows.
ING - So what! Again it says NOTHING about heterosexual marriage, or about homosexual marriage being wrong. Nor again - is it wife. It is woman.
His expression, "have you not read" is obviously referring to the Hebrew Scriptures which is where the account about Adam and his wife are recorded. Since God is the one who "yokes together" two people who are viewed by him as "one flesh", the yoking is not two people of the same sex. Males and females are anatomically "made" for each other. Couples of the same sex are not. So sexual acts between these are not "natural" but perverted. (unnatural) The intent of the sexual act between a man and his wife were intended to produce children. The fact that it was pleasurable, was a bonus, not the exclusive reason to engage in it.
ING - Again - no marriage is mentioned. No Gay marriage is forbidden. It is only talking about procreation needing a male and female. Nothing you have posted makes homosexuality unnatural, or perverted.
It is relevant because getting married was not always a formal ceremony. God did not perform a marriage ceremony with Adam and Eve.....he simply brought her to the man.