Moral relativism is the philosophical theory that morality is relative, that different moral truths hold for different people.
According to moral relativism, it makes no sense to ask the abstract question whether a given act is good or bad. According to moral relativism, there is no goodness or badness in the abstract; there is only goodness or badness within a specified context. An act may thus be good for one person but bad for another, or good in one cultural setting but bad in another, but cannot be either good or bad full stop.
- Christian morality Atheism wiki on Christian morality