The issue is that the vast majority of people don't view religion as "what I should or shouldn't do." They view it as "what should and shouldn't be done." They can't just follow the tenants themselves; in order to follow their religion - at least not the way they interpret it - they need to make sure the tenants are being universally followed. That's why religion is always at odds with society as a whole unless that society is already overbearingly religious. It will never change unless there are no major groups within society with different beliefs than the norm.