CLARKSTON, Ga., Sept. 21 — When the Rev. Phil Kitchin steps into the pulpit of the Clarkston International Bible Church on Sunday mornings, he stands eye to eye with the changing face of America. In the pews before him, alongside white-haired Southern women in their Sunday best, sit immigrants from the Philippines and Togo, refugees from war-scarred Liberia, Ethiopia and Sudan, even a convert from Afghanistan.