In The Atheists Debaterís Handbook, B.C. Johnson writes:
[N]o Christian can afford to claim that we cannot judge God. If God creates the rules by which behavior must be judged and if the rules do not bind their Creator, then there is nothing that is improper for God. Therefore, when God promises that Christians will go to heaven and atheists will go to hell, there is no reason to believe that he will not break his promise and send Christians to hell and atheists to heaven. In fact, it is just as likely that he will break his promise as it is that he will not.
What possible grounds could the Christian have for maintaining that God will keep the promise in question? Godís love for Christians? But we could not call him unloving if he sent ChristIans to hell, for this would be to judge God. Could we say that God will keep his promise because he is honorable? But again, if God broke his promises we could not judge him to be dishonorable, for that too would be a judgment.
If, then, we must hold that whatever God does is the right thing, then we have no way of knowing what he will do. The Christian who insists that we cannot judge God is also adhering (although inadvertently) to the belief that Christians will go to heaven is just a guess, and anyone elseís guess is just as good. If Christians are right and we cannot judge God, then Christianity is in serious trouble. It is not a religion but, in fact, only a self-confessed haphazard guess. [emphasis added]
The truth is, believers canít avoid making any sort of judgments about God. A complete avoidance of judgments would reduce religious language to little more than neutral observations and this wouldnít attract anyoneís long-term interest or loyalty. Religious language and ritual is full of judgments, not only about the world generally but also about what God has planned for it.
So, if believers say that we cannot judge God, they donít meant it in precisely that manner: they donít and wonít act like they believe it and they donít accept the implications of such a position. At most, they merely mean that we canít judge God in this way and in these circumstances. Itís a very limited assertion that amounts to a form of special pleading: itís OK to ďjudgeĒ God when you say good things, but not when you say bad things.