There are books on this and I can't link them. Religious Tolerance.org does the best job online of spelling it out. But I'll give you a an overview.
In Sodom and Gomorrah the sin is not homosexuality, but inhospitality. In Leviticus we find another misreading:
The word “abomination” is found, of course, in the King James translation of Leviticus 18:22, a translation which reads, “Thou shalt not lie with mankind, as with womankind: it [is] abomination.” Yet this is a thoroughly misleading rendition of the word toevah, which, while we may not know exactly what it means, definitely does not mean “abomination.” An “abomination” conjures up images of things which should not exist on the face of the earth: three-legged babies, oceans choked with oil, or Cheez-Whiz. And indeed, this is how many religious people regard gays and lesbians. It’s Adam and Eve, not Adam and Steve. Homosexuality is unnatural, a perversion, a disease, an abomination.
Yet a close reading of the term toevah suggests an entirely different meaning: something permitted to one group, and forbidden to another. Though there is (probably) no etymological relationship, toevah means taboo.
The term toevah (and its plural, toevot) occurs 103 times in the Hebrew Bible, and almost always has the connotation of a non-Israelite cultic practice. In the Torah, the primary toevah is avodah zara, foreign forms of worship, and most other toevot flow from it. The Israelites are instructed not to commit toevah because other nations do so. Deuteronomy 18:9-12 makes this quite clear:
When you come into the land that YHVH your God gives you, do not learn to do the toevot of those nations. Do not find among you one who passes his son or daughter through the fire; or a magician; or a fortune teller, charmer, or witch… because all who do these things are toevah to YHVH and because of these toevot YHVH your God is driving them out before you.
Does the Bible Really Call Homosexuality an ?Abomination?? | Sexuality/Gender | Religion Dispatches
And in Romans, the language is heavily influenced by the time in which King James wrote the Bible. Books explain this better, so a visit to your library is likely in order. But the paraphrase is that King James, living in the time of a belief in natural order, added this idea to the Bible.
I can't really duplicate years of study for you here, but I think before you throw stones, some investigation on your part might be helpful. And seek those who disagree with your position if for no other reason than to know the rebuttal.
But I'll give you some reading all the same:
Church Tradition Only Condemn Homosexuality Not The Bible
Church Tradition Only Condemn Homosexuality Not The Bible
New Book: Homosexuality, The Bible, The Truth
New Book: Homosexuality, The Bible, The Truth | Truth Wins Out
What the Bible Really Says about Homosexuality
Daniel Helminiak's Web site
All about religious tolerance: the ReligiousTolerance.org web site