The resources are there for a member to be informed of the official stance of the church but more than a few pious folk opt to wander down to Lifeway or some other purveyor of Evangelicalism and read what is on the shelf, which is usually speculative millenialism in the tradition of Darby and Scofield.
Emphasis mine...
I remember well when I was first introduced to millennialism in college. It was in a non-denom youth group, where a lot of us had study Bibles... but the only study Bibles out there at the time that had extensive notes (as opposed to just textual notes) were ones like the Scofield reference Bible. So those were the ones we bought, because we wanted commentary with our Bibles. I am SO grateful that I bought the Thompson Chain Reference Bible instead. It didn't have the commentary, but it really got me to understand how Scripture isn't just one verse here and there, but really connected in an over-arching narrative.
Anyway, my point is that in the 70s and 80s, when we didn't have the explosion of special-interest Study Bibles that we currently have, the most commonly found (and bought) were Scofield and the like. So their millennialism spread widely. Now, especially with Left Behind, it's become rather ingrained in the "collective unconsciousness" of American culture. Most non-Christians I've talked to assume that all Christians believe in the rapture and tribulation. (the "in case of rapture this car will be unmanned" bumper stickers don't help, either...)
Eschatology, while interesting, is not a huge emphasis in most amillennial-teaching churches (for lack of a more descriptive term). Yeah, we may hear a bit about it in November at the end of the church year, and our Pastor's done an adult ed class maybe twice in the past ten years on the subject (mostly as a response to a surge in interest in the culture). But it's really not a huge theological discussion in Lutheran circles. We know we don't have to work to avoid, or warn people about, being "left behind". So it's not a big deal in our theology, except as a reminder that Christ will return in glory.