The very existence of "doing acts in order to avoid your fear and belief of hell" is flawed and unethical, because it says nothing about avoiding harming yourself or others. Some believe that harming yourself and others is a way of going to heaven or avoiding eternal torture. Religion can always be reinterpreted to mean things that are unethical and immoral.
Ethics based on mutual benefit or at least actions that result in non-zero-sum benefits can be considered as a viable alternative that will increase the well being of everyone involved.
The Koran teaches Muslims to do right in all things. It is incredibly similar to the Bible in that
way. There is no teaching in the Koran
that is unethical or immoral. Islam
teaches Muslims to strive for perfection in all they do. The Koran encourages believers to do right so
that they can be blessed for their good deeds and go to heaven.
The Qur'an is just like the Bible for Christians. It has good and bad lessons in it. Just because it is the main book of a religion that the USA does not particularly like, does not mean that the Qur'an encourages unethical behavior. In fact, I do believe that most of the items in the Qur'an are for ethical behavior.