Chesterson should stick to topics he knows. When one stops believing in God they turn to believing in themselves. At least some do. Like everything else in this world gross generalizations will be wrong more often than they're right. With 6 billion people on the planet predicting the hows, whys and results of any individual thought within any individual person is an excercise in foolishness.
Good God, can't you get anything straight. First it is the mysterious Catholic founding of Virginia, which has somehow escaped the knowledge of historians. Now you complain that the greatest popular writer in English of his era on the subject of religion, from a Catholic perspective, should not write on religion, but 'should stick to topics he knows'. He was a contemporary of Cardinal Newman, the convert from Episcopalianism to Catholicism, who was a better writer, but who wrote for the intelligentsia.
One or two more of these, and I will start to doubt anything you post, without linked proof.