Here's a crucial portion of the first sermon:
Listen to me carefully, O Southern Baptist church. On Capitol Hill. This is one of the problems with referring to any country as a Christian nation. Just because the principles of Christianity clearly influenced our nations founders (and they did) and some of they themselves were evangelical Christians (I think Sam Adams was) and even if the Supreme Court has recognized the long history of significant Christian influence in our nation (and they have in decisions), that does not mean that most Americans are Christians, or that a Christian worldview dominates our public culture or our government today, or that one needs to be a Christian to be an American citizen.
Friends, Augustine understood these complexities far better when he wrote in his book, The City of God, about how we as Christians find ourselves simultaneously being citizens of two cities—the City of Man and the City of God—at the same time, citizens of both. The legal establishment of Christianity in many nations—centuries after the Apostles—reflected an already-distorted understanding of the gospel, and led to terrible confusions as the Church wielded the sword in religious wars and inquisitions. [repeated in original for emphasis] . . .
And friends, I've got to tell you, I think we're tempted to similar confusions today. [A portion of a riff on the misuse of Chronicles 7:14 is omitted here.] I think Christians' identification of their land, whatever it is, with "Israel" in 2 Chronicles 7:14 is very well intended, but it is confusing. There are no specific promises in the Bible like that for any nation-state in the world today. Though, it is true, we should always repent, and God may, in his mercy, bless our land.
The second sermon lacks a similar, lengthy expression of a pivotal thesis. (I'd highly encourage you to listen to the whole thing to get a clear sense of the overall message.) But this statement illustrates a bit of the contrast, and serves as a useful expression of some basic assumptions:
[T]here's a common blessing out there for people that will follow—nations that will follow—God's laws, God's principles. God's moral law, when it's exalted, certainly brings the blessing of God on a nation and on an individual. And so do not discount the fact that God has raised up America and blessed America because we have been a—yes—a nation founded upon his principles, upon Christian principles.Another direct contrast is the first speaker's clear emphasis on the fundamentally international nature of Christianity, versus the second speaker's incredulity that young people would question saluting the American flag in church. You may also note the juxtaposition of a dispensationalist who expresses affirmation for the application to the United States of OT promises made to Israel, with the non-dispensationalist who finds that application confusing.
The above quotes are merely brief samples. Maybe 2-3 minutes out of a combined 100+ minutes of preaching. I'm not at all interested in the comments becoming an argument over whether those two sound bites fully display a fundamental contrast. I am arguing that the two sermons do precisely that. So in the comments, please refrain from debating whether my thesis is correct until you've listened to both sermons in full. Feel free to engage in other forms of discussion as you wish.