Many of Gregg Frazer's lectures have been uploaded to The Master's College's Pulpit Files here. You can listen to a number of them where he discusses the Founding Fathers and religion.
This is the newest lecture. He discusses the Romans 13 obedience/submission dynamic that I've featured on my blogs.
It's a refreshing orthodox biblical perspective that you don't oft-hear. For instance, you'll hear Dr. Frazer justify, on biblical grounds, 1) the idea that Christians are to pay all of their taxes. All of them, even if you think they are unjust. And 2) Christians are to obey government simply because government said so; that is, unless government commands a believer to actively or by omission sin (for instance tell a believer to stop preaching the gospel). That's the one exception to the always obey rule. That means you drive the speed limit because government said so.