When looking at the dead sea scrolls it is easy to see that words and meaning in the bible today have different meanings. And if we look at the bible of today, The part where they discuss homosexuality has been changed so it looks like it is ok when it was, in the beginning, clear that homosexual act was seen as a sin. Today the word sin has been removed because it is "evil" to call someone a sinner. So yes the scripture has been changed and lost its true meaning in many ways. And if I remember correctly it even says in the bible, You should not change even one word of the truth that was given in the teaching.
I cant say i have seen any bible that condones homosexuality, on the contrary, most christians will cite verses that condemn homosexuality.
There are many instances of the word sin (or derivatives, sinner, sinned etc) in the bible. Even modern ones.
And if i had a euro for every time i have been called a evil and a sinner because i dont bow to any god, wow, rich beyond dreams