Peter L. Berger

An unexamined faith is not worth having, for fundamentalism and uncritical certitude entail the rejection of one of the great human gifts: that of free will, of the liberty to make up our own minds based on evidence and tradition and reason.

By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning.