The offense wasn’t in offering a Christian prayer in the presence of non-Christians, but in participating in a non-Christian religious ceremony after announcing himself as a member of the LCMS clergy.
My wife, Nicole, used to attend an ELCA seminary, Lutheran School of Theology Chicago, and she heard some professors say that the devil doesn’t exist. She gladly transferred from LSTC and graduated from a non-Lutheran seminary, Trinity Evangelical Divinity School, which is in Bannockburn, IL., and, in Dec., she was ordained by the Lutheran Evangelical Protestant Church (LEPC).