They say that an increase is superstition over realism is usually a sign of people avoiding reality and seeking solace is the 'Supernatural'. Possibly by believing the world was made (remember we hear very little about how many percent of, say, Iran, believes the world was made by God) we try to avoid responsibility for what we are doing to it?
By saying this is God's plan or will, maybe we are simply trying to say 'Don't blame us! God screwed up!'?
I think a lot of people in the world are far too scared to not believe there is a plan or a supreme being, because that would mean their actions are their own and no-one elses, and, depending on the action, that can be a shameful thing.