Bad Religion by Ross Douthat

Against the notion that our country is becoming increasingly secular, Douthat advances the thesis that it is as religious as ever - only that religion is no longer orthodox Christianity but a variety of Christian heresies. These heresies dispense with the tensions and demands of the traditional faith and, usually, replace it with some sort of self-affirming vacuity. There's a lot more to it than that. An insightful read.