I was introduced to Luther, and by extension Lutheranism, by a professor of mine at an Evangelical seminary I attended. I thought I was a pretty convinced Southern Baptist until I realized that Luther nailed me and my pietism on too many things.
The summer after my first year at seminary I started attending a Lutheran church off and on and discovered the irrelevance of Lutheran worship and Lutheran preaching. Why irrelevant? Not once did I walk out of that church with steps to improve my love life, my bank account balance, my job prospects, or my social skills. In fact I don't think I ever walked out with steps to improve anything, because all I ever heard about was my sin and my Savior.
Two back-to-back Sundays during this summer stick in my mind. The first Sunday I attended my regular Baptist church. I don't remember the sermon title, or much of anything about the sermon as a matter of fact, despite the power point and my careful note-taking. I do recall, however, the pastor suggesting that if we wanted to grow in our Christian lives we should take advantage of all the great resources available to us today. If we had financial problems there were books on that, if we had marital problems there were books on that, if we wanted to improve in just about any area we were just about guaranteed that someone had written the book for that struggle which would detail how to be a good, virtuous Christian. The following Sunday I attended the Lutheran church, and received a very different answer to the exact same question-- Jesus. And not just some abstract Jesus who gives me a warm fuzzy feeling in my heart sometimes, but a Jesus who died for my sins, vividly portrayed by the crucifix in front of the church. The pastor didn't tell what to do, but he told me what had already been done. For me.
In the view of pop-Evangelicalism it doesn't get more irrelvant than vestments, lectionaries, prayer books, hymns, or chanting. It doesn't get more irrelevant than preaching the same gospel to forgiven sinners week after week and month after month. It doesn't get more irrelevant than God's Word combined with water or the very body and blood of Jesus given for the forgiveness of sins. It doesn't get more irrelevant than the Church which desires to know nothing but Christ crucified for sinners.
It doesn't get more irrelevant than the Church being the Church.