Using terminology such as “sin” is characteristic of the Bible, as it is specifically used as that, and has no other meaning. For you to say that it isn’t a sin, then talk about how we should “screw the Bible” is basically using your own argument against yourself. Using words like “sin” is specifically derived from the Bible, and nowhere else, so when you use it in this context, it shows that you are referencing the Bible, which is also refuting you. Check your sources.