Professed Christians have committed every abomination you can think of but that does not make what they do acceptable to true Christians or to our God.
As to what pro-gay sites have to say about homosexuality in history, so what? Gay sites list David and Jonathon as lovers when in fact that is a lie. Gay sites have tried to prove that Jesus and some of His apostles were gay, which is another lie from the depths of hell. Pedophiles can refer to sites where child molestation was common, does that make it acceptable behavior in a civilized society?
You can attempt to rationalize your immoral behavior all you want without proving that you were born gay, created gay, or can achieve the fullness of God by being gay.