Most people assume that neither God's existence, nor his non-existence can be proven, and thus is a mere matter of faith. However I think this is wrong.

At first, God's existence is obviously provable. God just needs to appear in a burning bush in Central Park, or on TV, and hold a speech. This would already prove his existence.

More difficult is the question if God's nonexistence can be proven. There are about 20,000 different gods known, with very different properties, and obviously you can not prove the nonexistence of all possible gods. However can you prove the nonexistence of a particular god?

This depends on the god. For the Christian god as described in the Bible, I think the answer is yes. But not in the sense of a scientific proof, more in the sense of a legal proof, which means "beyond reasonable doubt".

Such a proof could go 3 ways:

- By experience: the god of the bible is described as affecting nature and affecting the affairs of people. When not the slightest trace of a godly force or influence can be found in any nature's law that was discovered so far by scientists, or in any period of human history that was reconstructed so far by historians or archeologists, the existence of this god is highly unlikely for all those observed parts of nature or history.

- By logic: the god of the bible is described as being our image, and thus following the same logic. When his behavior or intention makes logically no sense, such as with theodicy or original sin, we can conclude that this god does not match his own description in the Bible, and is a self-contradiction.

- By probability: As mentioned there are 20,000 gods known today, but there were a lot more in human history, probably more than 100,000. All have different properties, and most can not exist simultaneously as they contradict each other. The likeliness of the existence of one particular god therefore is about 1/100,000. The number of worshippers of this god does not matter here, because all those gods once had a majority of worshippers at some place and time in history.

This would be 3 ways to prove the nonexistence of a particular God, in the sense of legal evidence. But maybe someone can find even more ways?