Does GOD work through people even if they don't believe?

I ask because for some reason many Christians in America have taken the stance that global warming is a "farce" because GOD has everything under control. This is also somewhat coupled with the belief that scientists are trying to disprove Christianity. My offering is that if the scientists that have done the studies on global warming were given their intellect by GOD then wouldn't it be wise to listen to them? This of course hinges upon the question of whether or not Christianity actually represents an existing GOD but that is another topic entirely.