First of all, let me just point out that the example given, that extreme violence is acceptable if queer sex (and marriage) is acceptable, is, to be blunt, idiotic. There is no comparison between extreme violence and the result of a loving relationship between people.
Second, as someone who survived a queerbashing in which I took a baseball bat to the head (in 1989), let me also say: fuck you. You would not even suggest that example if you knew the horror of that kind of attack.
Moral absolutes? There are very few. Sex with children is one. Yes, such absolutes do exist, and to say somehow that moral opposition to queer sex and gay marriage falls into that catagory is a classic logical fallacy, specifically a False Anaolgy (since both A and B are similar in some quality [here, both gay sex and extreme violence are objectionable to many people], then they are directly comparable in almost all ways [wrong]).
As to whether anyone is actually saying the Bible is "BS" - well, for me it is a nice book written by men; I have read it cover to cover twice, and there is much wisdom in there. However, it is not of divine authority, IMO.
I am just saying that it should not, nor any other religious book or system, be used as a basis for making governmental decisions. If witches were in the majority you would not like it if we required our practices and beliefs to be the basis of societal decisions. That said, I do think it would be a much kinder society if a few more people saw the kindness of the whole world around them, and less of how they need to control what others do.
Kathy