Someone has claimed that Haiti's disaster is due to the fact that they made a pact with the devil many years ago. The basic idea that they (or some small group of revolutionaries long ago) made a pact with the devil (or some evil spirit) is not necessarily incredible. It's also not incredible that this is the judgment of God on the nation of Haiti. However, there's no good reason to pick out that particular sin as the cause of this judgment. Why not pick out Haiti's particularly loathsome treatment of children (link to report). There are lots of possibilities. It may well be God's judgment. While calamities like this can be and, in Scripture, frequently are the judgment of God, it may be something else. Recall Job. We should not be quick to judge Haiti, but those in Haiti ought seriously to consider why God brought this, and if they find sin, they ought to repent of it.