It is not true that Abraham and Moses brought the ideas of morality and the value of life into the world. These ideas were known to Adam and Noah—it's just that, over time, humanity had almost forgotten them.
What these giants brought to the world was an even greater idea: that the essential values for humanity's survival can only endure when they are seen as a result of monotheism. They must be linked to a higher reality, and that reality consists of the knowledge of the Oneness that gives us existence.