There are many great morality lessons in the Koran, however they are secondary to the Bible, and this is signified by the prominence of the Ten Commandments, in the center and largest.
Which commandments are used in our laws?
"ONE: 'You shall have no other gods before Me.'
TWO: 'You shall not make for yourself a carved image--any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth.'
THREE: 'You shall not take the name of the LORD your God in vain.'
FOUR: 'Remember the Sabbath day, to keep it holy.'
FIVE: 'Honor your father and your mother.'
SIX: 'You shall not murder.'
SEVEN: 'You shall not commit adultery.'
EIGHT: 'You shall not steal.'
NINE: 'You shall not bear false witness against your neighbor.'
TEN: 'You shall not covet your neighbor's house; you shall not covet your neighbor's wife, nor his male servant, nor his female servant, nor his ox, nor his donkey, nor anything that is your neighbor's.' "
There are two that are in our laws now, and always have been. But laws against stealing and murder are in almost every culture in the world, including those who had laws before having any contact with judeo/christian faiths.
The law against adultery is iffy, because it has been struck down in most places.
So what is left is that 70% of the 10 Commandments are not and have not been laws, except in some unconstitutional instances, in our nation.
And the laws that we have used were also in the Code of Hammurabi, which either predates the commandments or is of the same time period. The laws that we have were also in use by the chinese when they had never heard of westerners, and their laws influenced the west later.