I’m sure the posters and readers on Planet Augsburg have encountered bumper-sticker theology before. In my experience, it is usually simplistic at best and snarky at worst. For example, a line such as “My God is too big to fit inside of your God’s box” might be brought out as a supposed “trump card” to win an argument for a universalist interpretation of what/who God is. However, such little quips are more harmful than helpful in rational arguments–no matter which side makes them. They are more for shock value than anything, and in many cases it seems as though their sole purpose isn’t to enlighten the discussion but to silence the opposition.
The specific bumper-sticker theology line that I’m thinking of is the question “Is God so powerful that He can make a rock that even He can’t lift?” There are many atheists who believe that they have the Christian by the short hairs when they ask this seemingly omnipotence-refuting question. The Christian’s answer of ‘yes’ or ‘no’ will undoubtedly be met with the “haha gotcha!” response: “But I thought you said God was omnipotent!” Many Christians might be at a loss for an explaination to this seemingly paradoxical point in the existance of an all-powerful Deity. I believe, however, that even responding to the question with a ‘yes’ or a ‘no’ in the first place is futile because it gives validity to what is otherwise a ridiculous question. In his book The Problem of Pain, C.S. Lewis addresses briefly how such arguments against an all-powerful God are not quite as solid as your average bear might think:
The absolutely impossible may also be called the intrinsically impossible because it carries its impossibility within itself, instead of borrowing it from other impossibilities which in their turn depend upon others. It has no unless clause attached to it. It is impossible under all conditions and in all world and for all agents. ‘All agents’ here includes God Himself. His Omnipotence means power to do all that is intrinsically possible, not to do the intrinsically impossible. You may attribute miracles to Him, but not nonsense. This is no limit to His power. If you choose to say ‘God can give a creature free will and at the same time withhold free will from it’, you have not succeeded in saying anything about God: meaningless combinations of words do not suddenly acquire meaning simply because we prefix to them the two other words ‘God can’. It remains true that all things are possible with God: the intrinsic impossibilities are not things but nonentities. It is no more possible for God than for the weakest of His creatures to carry out both of two mutually exclusive alternatives; not because His power meets an obstacle, but because nonsense remains nonsense even when we talk it about God. [emphasis author’s]
C.S. Lewis, The Problem of Pain, Chapter 2: “Divine Omnipotence”
I was going to write my own summary of Lewis’ quote here, but the last sentence of the paragraph does that better than I could. Nonsense spoken about God is just that: nonsense. It would do most Christians well to realize this point and not to lose any sleep over weak, illogical arguments against the faith.