"If you have faith as small as a mustard seed," Jesus says in the Gospel ofMatthew, "nothing will be impossible for you."That sounds good, but does it work in a world where seeds are geneticallyaltered by an impatient few and hard to come by for countless others? In aworld where the gulf between the very rich and the profoundly poor isconstantly growing, can a mustard-seed faith make any difference? And cansuch a little bit of faith be sustained...