Who does the mayor expect to be invited to speak at a Christian event?   Someone with wishy washy middle-of-the-road views on the Bible?  Someone who doesn't purport to interpret the Bible in his/her own way for the purpose of promoting a particular brand of Christianity?  

Gregor regularly deals up notions that beg speculation as to what distorted reality planet he is from.  That he would imagine that a Christian event would look to the local mayor for guidance on who to invite to address event participants speaks to some sort of galloping ego/personality disorder.