The band in church is too loud.

IF YOU HAVE PROBLEMS WITH THE BAND IN CHURCH BEING TOO LOUD

Quite often a space that is acoustically suited to congregational singing isn't suited to a gospel rock band. 

Sometimes, a lot of money is spent on making it right for the band and the congregational singing no longer works. 

The acoustics can be made to work for both but it's a complex design needing quite a bit of experience.

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Most commonly, the band has a drummer and a bass rig on a small stage which is close to the front seats. There is NO WAY this can work. Even if the PA is turned off, it will be too loud in the front seats and probably everywhere. Again, there are great ways around this but they take skill and experience e.g. setting up in ear monitoring, electronic drums etc.

Basically, the technology has been adopted way too quickly, probably because PA systems are big and glamorous. The groundwork hasn't been done to make sure the space can work acoustically in different modes and the band can play without blasting people out of their seats. So slow down, get good, qualified advice, spend some time and money on the less glamorous components, and everyone can be happy.