If there is a mega church, or a big church, there are often two prominent judgments: It's a revival or it's the triumph of Satan.
Of course, a third "non-judgmental" is not relevant here.
In order to be a better judge, as all Christians will be judges of even angels, one can easily analyze the situation by observing the surrounding, for how can a mega/revived church not affect its surrounding: both secular and non-secular.