I'm not sure what your trying to say, but with the people of countries/areas like PNG, the only real option is to replace their violent, torturous and inhumane superstition with one that is, at it's core, focussed on something more positive. These people are very spiritual and evangelising atheism simply would not work in the short or medium term.
> "seem to fix the immediate problem"
But the thing is, it is a fix to the immediate problem. Those people that were praying with her were praying. Not torturing and physically abusing. Even if you think it will just lead to issues down the road, we need to stop this torture and abuse in whatever way possible. In my opinion, the best way to do that without restructuring the government and pouring in money to cut down on corruption seems to be evangelising.
But, what I'm more interested in knowing is why you're face-palming hard enough to leave marks. Yes, humans will do things that are horrible no matter what the religion, but what's so terrible about teaching them to follow doctrines that forbid what they're doing rather than ones that compound the problem?