a1.4: The measure of good and bad [...] is the Sacred Law, not reason.This is totalitarian, diabolic, and irrational, "For all the gods of the Gentiles are devils: but the Lord made the heavens." (Ps. 95:5). Catholic Christians believe that the natural law,
written in [even the Gentiles'] hearts,"is a participation in us of the eternal law," of the Divine law (Summa Theologica Iª-IIae q. 91 a. 4 arg. 1). A gloss on this verse says: "'written in their hearts,' as to the existence of a God [and that] their reason tells them that many sins are unlawful." Moral law is founded on reason and perfected by faith; grace builds on nature. Muslims apparently think that Allah and Sharia law is so far above human reason that it can even contradict it. It is no wonder Sharia law also condemns as
a7.2 Unlawful knowledge [...] (2) philosophy [...] (5) the science of the materialists [...] (6) and anything that is a means to create doubts (n: in eternal truths).Of course truth to Muslims must means whatever Allah's messengers say, a sort of relativism of truth. It is within this context of faith and reason that Pope Benedict so skillfully gave his Regensburg lecture in 2006 which affirmed that the Trinity, Λόγος, is the God of reason.