This is theory: During slavery, blacks have limited opportunities to worship. When they could, even then the masters would still interrupt service and send for certain people. Those people, out of respect for the service, would hold up a finger (usually the pointer- NOT THE MIDDLE ONE) to symbolize two things:
1) They were sorry for interrupting the service and wanted to show respect.
2) They hoped to return in “1” moment (symbolizing the finger)- even though that “moment” usually outlasted the service.
What do you think?