If all of life can be explained by evolutionary theory apart from God, and if there is no God who created us (or at least if we cannot know anything about Him with certainty), then there is no supreme Judge to hold us morally accountable. Therefore there are no moral absolutes in human life, and people's moral ideas are only subjective preferences, good for them perhaps but not to be imposed on others. In fact, in such a case the only thing forbidden is to say that one knows that certain things are right and certain things are wrong (Wayne Grudem and Jeff Purswell).