Asking scientists about religion and God and ultimate meaning is kind of insulting and sacreligious, and dare I say it, stupid.  Lex, you should have some 'experts' in metanoia on to discuss these things, like Shinzen Young, or Ken Wilber.  Scientists at Brian Greene's level are more than likely fairly autistic and a kind of idiot-savant, with little experience or interest in the wisdom traditions.  Yet they often feel comfortable pronouncing on such things.  Physics, as conventionally understood, is after all inherently meaningless, as meaning is 'interpretations' which are irrelevant to actually 'doing physics'.  As Newton said, 'Hypotheses Non Fingo'.