Electronic Amplified sound (microphones etc) has only been around the last century or so.
You can't 'turn' the sound down if it's naturally loud.
Mostly it would be electric guitar, but drums and clanging cymbals are also noisy, and not many people lead or sing without mics. If they are not singing with mics then they will be lipsynching to a backing track. Hence the need for speakers in church and 'sound guys'
If you had natural acoustics, there would be no need for this. this is why some churches hold their services in auditoriums.
Anyway, if you want to see a production, a song, dance and a show - a performance, maybe go the a CCM concert, or watch one of those Andrew Lloyd Webber musicals, like Jesus Christ Superstar of Joseph and the amazing technicolour dreamcoat.
Those have way better costumes than CCM concerts, who still dress like hipsters from the 90s - black t shirts with scripture on them and skinny jeans.