That was my same reaction when I saw those numbers. Being a lifetime LCMS member, I've never run into any LCMS minister who did not believe the entire Word of God.
I'm a recent LCMS convert myself, born and raised Episcopalian. Our parish, and I thought the whole synod, considered the Word of God inerrant.
Most if not all of the older congregations do consider the Bible as the Word of God. There are some newer inner city congregations that are more "liberal" in their teachings.
It is, and we do.
http://www.lcms.org/pages/internal.asp?NavID=2516