Change?

How Do you expect People to change, if they yet to know God?
A Friend Of Mine said this:
''what ever happened to common courtesy? what ever happened to do on to others as you would do on to your self? i realize these two things will never happen to there full extent but even in there smallest of forms, where did they go? to those who dis agree with this and think that they truly get joy from causing others torment with out cause or reason, you people deserve either the time to change or time before being hung with your own cruelty''
My Response to this was ''it Died with our own self judgement.......own reflectiveness of our actions........It stills lives with God, but how do you expect People to change without Him......?'' I Mean think about it, do those who do not know God know their in sin?-No, i mean Yes they know ''Right'' From ''Wrong'' in THEIR worldview,(To not Kill,Steel..ETC.)
But as far as common courtesy, that statement, ''What ever happened to common courtesy''- How do define it to everyone if they do not truly know the right standards? (Gods standards),The Answer is to let God lead us to what is right or wrong. My Youth Pastor Said once ''Wouldn't it be great if we had a handy dandy book that told us what to do in any circumstance we face while following Gods way?'' To myself i was sitting there thinking yes! that would be great, His next words surprised me greatly,He Said ''well friends,We do, It's the Bible'' -that's truly how to define the right from the wrong through Gods way.