As a confessional Lutheran I hold to the Confessions as a faithful exposition of scripture. There's nothing in the Confessions about YEC. I don't agree with the LCMS stance on it but I don't have to. Personally, I don't think that the theory of evolution and the Genesis account of creation are incompatible.

Augustine seemed to think we shouldn't interpret scripture while ignoring scientific knowledge:

Often, a non-Christian knows something about the earth, the heavens, and the other parts of the world, about the motions and orbits of the stars and even their sizes and distances, … and this knowledge he holds with certainty from reason and experience. It is thus offensive and disgraceful for an unbeliever to hear a Christian talk nonsense about such things, claiming that what he is saying is based in Scripture. We should do all we can to avoid such an embarrassing situation, which people see as ignorance in the Christian and laugh to scorn.

The shame is not so much that an ignorant person is laughed at, but rather that people outside the faith believe that we hold such opinions, and thus our teachings are rejected as ignorant and unlearned. If they find a Christian mistaken in a subject that they know well and hear him maintaining his foolish opinions as based on our teachings, how are they going to believe these teachings in matters concerning the resurrection of the dead, the hope of eternal life, and the kingdom of heaven, when they think these teachings are filled with fallacies about facts which they have learnt from experience and reason.

-- Augustine, The Literal Meaning of Genesis