I have Read the entire Book of Genesis and have never heard of Lilith, so perhaps we have different beliefs.
Wow. You actually have read it. Very good. Lilith didn't appear in Genesis. I was just laying a little trap to see if you'd fall into it. She appears in texts that pre-date the bible. Lilith was the first woman Adam had (who was not created from his rib (hence "bone" humor). She refused to be subservient to Adam, so she was denied the Garden and God had to find someone else for Adam to bone.
As for allegories 2 Timothy 3:16 disagrees with you.
I disagree with Timothy. If he were right, and the events of Genesis were real, then there would be no human race. See, there's this thing called "viable population," and it dictates how many people and how much differing genetic material you need in order to have a population of a species that would be viable for 100 years or longer.
In general, you'd need 30 men and 30 women. Each woman must have one child with three different men. Each of the female children born must have three children with three of the male children born (when biologically appropriate) who are not blood-related to the parents of the female in question. Then they can kind of start commingling a little until there's enough genetic difference that you don't have to worry about inbreeding so bad that you get a baby that's really just a cyst with teeth and hair.
This is where most people get it exactly wrong. They think it was Adam, Eve, Cain and Abel. But the alleged Adam and Eve had more alleged children than just the famous two. Like any background actor in any play, they didn't get named. But that still means that if you believe the Garden story that incest birthed humanity. Square that circle, if you will.
Well just got to your Religious Bigot comment, and since you seem to Practice a religion I am not aware of we should just leave it there, my name calling days are over. Marriage or at least the concept was instituted in the Bible in Genesis later confirmed by Jesus in the New Testament.
No, marriage was not instituted in the Bible. Marriage existed prior to the bible. Marriage is an ancient custom that pre-dates recorded history. Its concept is not rooted in love or religion but in strategic alliances that would strengthen bonds between tribes or families that would otherwise be killing each other.
And that's not all. Polygamy was the name of the game. Men (including Jacob and Kings David and Solomon) often had multiple wives. In fact, the only reason to only have ONE wife was because you simply couldn't afford more - which is why so few had harems (this, by the way, shoots that whole "one man/one woman" thing in the foot). Most people weren't wealthy kings.
The concept of monogamy grew out of this fact that poor men could only afford one wife, but it didn't take its church-imposed form of "one man/one woman" until somewhere between the 6th to 9th centuries CE.
There's a brief, quick-and-dirty history of the start of marriage. The bottom line is that it did not start in the bible and in fact existed for thousands of years before the bible. The oldest written reference to the institution of marriage comes from Hammurabi's Code of Ancient Mesopotamia.
And the Code of Hammurabi existed for about 1,000 years BEFORE Moses.
Can you explain to me why as a Christian I should celebrate a union between same sex couples
No, I can't. I certainly never told you to celebrate it. You shouldn't have to celebrate it if you don't want to, but you don't have the right to force someone else to bend to your will because you don't like it.
can you explain to me why telling them their sin not unlike any sin, will keep them form eternity in Heaven.
Who asked you to? I've said this before (although it probably got lost in the server crash): Of all the people I have ever known, in all the places I've been and all the things I've done it has always and ONLY been Christians who have berated me for believing something other than them. It has ONLY been Christians who have told me that my wife and I are going to hell because we're Jewish. It has ONLY been Christians who have done so on the Sabbath as we left temple. It has ONLY been Christians who have shown the kind of religious bigotry that wages war against anyone who is NOT Christian, while claiming there is a war on Christianity.
So if you're telling people anything about whether or not they're "sinful" without them first soliciting your religious opinion, who are you to open your mouth to them?
Doing so shows a level of arrogance that is unconscionable. It's also something that God is really down on. References to arrogance appear more than 200 times in the bible, and the bible tells us that the arrogant are an abomination unto God. So there's that.
I did provide an answer you just disagree with it so we disagree that is all
But you didn't provide an answer to the question. You provided your opinion, but you haven't given any facts about how gays marrying each other harms anything at all in any way.
I've asked you specifically: Since gays can now marry, do my wife and I have to get divorced? You haven't answered even that (although the answer is obvious).
But let's carry on with those questions: Since gays can now marry like everyone else, does that mean:
1) My wife and I must divorce
2) My wife and I must stop having sex
3) My wife and I must separate and live apart from each other
4) I love my wife less
5) My wife loves me less
6) My marriage is somehow less legal in the eyes of the law
7) My marriage is somehow less valid in the eyes of God
Start with those simple "Yes or No" questions, if you like. If your answer to them is "No," then it means that gays being treated equally when it comes to civil marriage has not harmed the concept of "traditional" marriage at all. If your answer is "Yes," then please explain in detail.