In quite a lot of Western evangelicalism, there is a worrying tendency to focus on the periphery. I have a colleague in the Missions Department at Trinity Evangelical Divinity School whose analysis of his own heritage is very helpful. Dr Paul Hiebert laboured for years in India before returning to the United States to teach. He springs from Mennonite stock, and analyses his heritage in a fashion that he himself would acknowledge is something of a simplistic caricature, but a useful one nonetheless. One generation of Mennonites believed the gospel, and held as well that there were certain social, economic, and political entailments. The next generation assumed the gospel, but identified with the entailments. The following generation denied the gospel: the entailments were everything.
Assuming this sort of scheme for evangelicalism, one suspects that large swathes of the movement are lodged in the second step, with some drifting toward the third.
D A Carson in Basics for Believers (reflections on Philippians) pages 26-7