It is possible that the Scientologists are there because they genuinely believe that they can help the Haitians to get rid of their clusters of confused Body Thetans.
More cynically, poor Scientologists can do volunteer work in exchange for auditing sessions.
And it would be pretty low to belittle someone who is in the middle of all that pain and suffering - and actually helping people, regardless of their religious stance... However, this is Blasphemes. They aren't helping. They are performing their brand of pseudo-science on these poor people, touching their damaged body parts to get "the nerves in harmony". Although the real doctors there say they don't really care about what these Scientologists are doing.
The Voodoo ought to be able to wipe out anything Scientology can dish out.
And the Methodists.