You are quite eloquent and make a valid point.  However, there is another point of view.  The speaker had several options.  He could have prayed for himself, prayed according to a specific doctrine, prayed specifically for the event or prayed relative to his audience.  Apparently his prayer was relative to his audience.  He chose a prayer that spoke to their relative emotional needs and used their forms of verbal self-expression.  You contend that speaking to the emotional needs of his audience, using their terminology and their forms of self-expression is pandering.  You also imply that the words and phrases of some other culture are more fitting; more appropriate and more sacred.  You marginalize the values of this audience and relegate this speaker’s cultural appreciation and recognition to simple pandering.  The fact that he warmed their hearts, lifted their spirits and touched their souls appears to be unimportant and irrelevant.

I understand your point of view.  However, it is clearly myopic in scope: not broad enough to embrace the emotional needs of others, too narrow to cover other cultural self-expressions and too judgmental to appreciate other valid viewpoints.  You seem to imply that God does not understand or appreciate the way we speak.  God said, “Have no other God before me.”  God said. “I am Alpha and Omega.”  God said, “Tell them I am sent you.”  This God—All Seeing, All Knowing and All Powerful God—knows all there is to know … about … SWAGGER!!