Yes, and its pointless and stupid. I don't play THE WEST for "mystery". Its a western themed game not a mystery themed game. If I want mystery I find another game for that.
Real people in the Old West didn't know what definite effects praying had either. Some believed in it and did it regularly, some believed it was a waste of time and never did it. The believers thought it did something but had no way for sure to know it did.