This article at Mercator suggests a link between secularism and Islam: Neither believe in a shared power structure between Church and State (one or the other always wins out).  Neither believe that faith and reason are reconcilable.  Both seek to destroy American capitalism.  Both have little belief in freedom of the will.  Both have legitimized violence to enforce political ideologies.  Both assign inferior status to non-adherents.  And, of course, both are co-belligerents in the cultural war against Christianity.  Read for yourself and tell me if this guy’s got something, or not.