Okay, i placed this in another forum but cannot recall which one so will give you all some help. I discovered a little snafu? maybe intentional of the designers:
Above the aqueduct, below that bridge and at the top right of the waterfall is a pitfall for your believers... if you drop a villager there, they are "stuck" Herd all of your rascals and yellow hunting heathens and bring them on up with an enticing villager until they are near the stuck villager, quickly remove the latest luring villager and the heathens will stay there taunting the "stuck" villager, and then you can have free rein of hunting and gathering.
Good Luck! If i could figure out how to place a picture here to help, i would have done so, so sorry.