There is allready a universal "code of conduct", as stated in the book of the law. This is not for you, but for other people. If you disagree with someone or with another religion, say and think to them: Every religious war was caused because of the violation of this one and only universal law. As soon as people start telling other people what they should not do, you have a conflict. Offcourse it doesn't mean that one can do anything. A serial killer allready does what he wants. If he is proven quilty, he is eliminated, because that is the will of most people on earth. The basic things are allready covered by the law and the justice-department. Let's not make eachother's lives miserable by imposing a "higher than thou" mode of conduct upon one another.