I find it extremely hard to believe that any Lutherans today believe that the Pope is the Antichrist. Can you cite any sermon, any modern church publication, any speech by a church leader, saying that the Pope is the Antichrist?
The Lutheran Book of Concord, which some Lutheran Church bodies accept as essential confessions of the Christian Faith, explicity equates the office of the papacy with that of the antichrist inasmuch as it attempts to supplant the righteousness earned by Christ with a righteousness earned by men, especially since that office takes its place within the Church, just as the Apostle Paul says of the antichrist.
Nevertheless, history being what it is, Lutherans continually engage in dialogue with the Roman Catholic Church and other churches in order to test what may or may not be in accord with what the biblical texts enunciate. Ultimately it is God who creates and sustains the Church, just as He created and sustains the world. But He does not do so on the basis of half truths perpetrated by his creatures.
Don't go to church, and honestly wouldn't know where to look for that information. I do have friends that are Lutherans. Quite a few actually. They are all hard-core Republicans, as is everybody that I have met from their church(es). (which is why I immediately assume that somebody is a Republican if they say that they are a Lutheran).
They all believe that the Pope is the antichrist, and they attend several different churches. Personally, I find that position irrational, but I haven't argued the point in a lot of years. It gets real hot, real fast.
We frequently discuss religion, but there a few things that I stay away from, and a few things that they stay away from as well. We like being friends. ;-)