Does the 1st amendment right to free speech limit an individual's right to speak freely whenever  and wherever he wants?  I believe it does....and THAT would mean so does a minister...whenever and wherever he is.  What ELSE does a minister do during services BESIDES try to persuade the congregation???  (And if people actually WERE persuaded by their minister's speech, I would submit there would be a whole lot less "sinnin" and criminality! LOL)...There is NO Constitutional right to shut someone down because you don't like what they say..  You CAN "not listen"...you CAN change to another church.