Putting out flyers that the whole of Christi-SCAM-ity is a hoax in prominent places would do the job. It does best to have them stuck on to make them very difficult to remove. Having people head to the Joy of Satan web site (and especially the Exposing Christianity section) might not disrupt the a$$embly up front. But, people might go home and do their research and find out that the whole LIE-ble is a farce, and then you will get more disassociations. That would disrupt the next a$$embly by preventing anyone from showing up.