Luther and others came to believe that the only thing in this world that is fully trustworthy and infallible is the Bible. It is, of course, subject to abuse, misinterpretation, and misapplication by fallen men, but it is clear and simple enough that Christians can understand it. Everyone then should be urged to read it and everyone who does so in faith will be blessed.
The LCMS might be shrinking and North American culture might be becoming more hostile toward Christianity, but hand-wringing is not a Christian ceremony. The Lord calls us to hopefulness and joy.
There is only one Church. We confess this in the communion liturgy when we say that we are lauding and magnifying God’s glorious name with angels and archangels and the whole company of heaven.
The Christian who prepares an “elevator speech” on Christ’s resurrection will be blessed in the preparation and opportunity to share it.