Affirming the Sovereign God (James 4:11-17)

James wants us to consider our lives in light of who we are in the Lord.  We might think that this is obvious and something that we should all be doing.  However, the reality is that our temptation is to look at the areas in our lives that we think are ordered properly and then judge others in the community in light of our walk.  Why is this such a problem?  How does such an attitude remove God from the equation?  How are we then acting as if we are not even Christians when we judge one another?