In 1998, Benke admitted that his participation in an interfaith prayer service was a "direct violation" of the Holy Scriptures, as well as of the Confessions and the Constitution.
Whether or not those Lutheran documents mean anything to you is not the point. As an ordained minister of the LCMS, Benke voluntarily swore to uphold the Lutheran Confessions and the LCMS Constitution (precisedly because they are in agreement with the Holy Scriptures, btw), as well as the Holy Scriptures, of course.
I have attended many other churches in my life, and I have read much concerning the doctrine of other churches (doctrine is simply what the members of the church believe).
Regarding the LCMS in particular, we have wonderful and Biblical hymnody and liturgy which are directly taken from the Bible. I am sure you have heard of the hymn, 'A Mighty Fortress is our God', well Luther wrote it in based on Psalm 46. If you look at our hymnal, you will see the Bible references listed to every hymn. You can find the Lutheran Hymnal online. Do a google search and see what you come up with. Please, before you attack, you should know what you are talking about.