Current research project

What is the foundation of law? Moral foundation? Then either it is a Christian based moral foundation or a natural law foundation. Natural law has a long history, but by 1250 it was strongly codified/explained by Thomas Aquinas as 'of God'. My current reading list: "A Line Through the Heart" and Written On The Heart", J. Budziszewski "Natural Law", Jacques Maritain "After the Natural Law", John Lawrence Hill "50 Questions on the Natural Law", Charles Rice "On Law, Morality and Politics" and "Summa Theologica", Thomas Aquinas "The Natural Law", Heinrich A. Rommen "Fundamental Principles of the Metaphysic of Morals", Immanuel Kant "Laws", Plato "Natural Law in the Spiritual World", Henry Drummond A Treatise of Human Nature", David Hume I'd actually be interested in a discussion on the following: Did a system of rights and morality exist prior to the religious foundations of Judism and Christianity? Is such a foundation applicable today?