Sigh. I’ll explain it again in seventh-grade terms.
Luther’s error was in thinking that he (and other individual believers) had the ability to infallibly define the teaching of the Christian faith for himself instead of submitting himself to the teaching of the Bishop of Rome and the bishops in union with him. He became “as God, knowing good and evil” by his own reason instead of humbly following the teaching given orally from our Lord to His Apostles and from them to us through their successors, the pope and bishops of the Church.
It is the orthodox Lutheran belief that Christians were obligated to follow the doctrine established by Scrpture when it conflicted with that established by man. Thus, Luther’s rejection of the sale of Indulgences (and thus the uproar over the ELCA’s rejection of Scripture on sodomy).