In interpreting God's laws, there is a principle in Islamic jurisprudence which states, "Reason is not a legislator." In other words, the only laws that apply to you are the ones God gave you. Reason has no authority or status in creating laws, or even in interpreting them.The political consequences of such a view are easy to see: If reason is not a legislator, then why have legislatures at all? They have no standing, because reason has no standing.
Everybody ought to read that article. It really explains the philosophical divide at the root of the crisis.