Why do so many Christians cling to Paul's writings on homosexcuality?

The primary reason Christians demonize gay folks is Paul's writings. However, Paul never used the term homosexuality. He used the term arsenokoites, which at the time refered to Temple Prostitution, a pagan ritual where a woman was impregnated within the temple of a god with the male acting as a conduit of that god to pass on the power of the divine. There was a whole other word for homosexuality at that time, Androkoites, and Paul did not use that term at all. In fact, even long after Paul had passed away arsenokoites still did not mean homosexuality, it came to mean prostitution, incest, or rape. In fact the Christian Writings of John the IV of Constantinople writes of "men hwho commit arsenokoitia with their wives...' Can't be gay with your wife, unless of course that means the wife is actually just another man taking on the role of wife, in which case, two gay people are married. Even later it came to mean exploitative pederasty. It was not until much, much later that it came to mean homosexuality. So, knowing all this, why do Christians swear up and down that the writings of Paul prohibit homosexuality?