It was a bit different back in the 3rd edition days, "good" and "evil" were slung around a bit more liberally. I believe it wasn't until the 5th edition when they introduced the "unaligned" state, which is sort of "neutral but without the commitment", and assumed most average folk were unaligned.

Presumably before the high cleric casts Holy Word there'd be a festival ahead of time in which people are given plenty of opportunity to donate to good causes (ie, the Church) to crank up their good meters before being "tested."