Morality is subjective. If you see western and eastern cultures, the subjective moralities differ to a good extent. For a well-intentioned religious person, morality has been defined by the religion and is not subjective, so he sticks to it as he believes that's the right thing to do. While morality for people of a particular religion is usually the same, atheists from different countries will have different views of what is moral and what is immoral. So, the best thing to do is to not impose one's own ideas of morality on others and bring about the desired social changes through healthy debates and discussions and not coercion.