Argumentum ad ignorantiam

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The argumentum ad ignorantiam (also known as the argument from ignorance or argument from (personal) incredulity) is a logical fallacy wherein the speaker claims that because a subject is not well understood, either by the speaker or by others, it cannot be true.


The argumentum ad ignorantiam is commonly used as a proof of the existence of God. The argument goes something like this:

  1. Gee, this sure is a big, complicated world.
  2. I don't see how it could have come into existence without an intelligence behind it.
  3. Therefore God exists.

This argument is also used to dismiss the possibility of biological evolution in this fashion:

  1. Evolution says that people just came into existence by chance.
  2. I cannot see how this is possible, so evolution must be false.

Much of creationism and Intelligent design is based on the argument from ignorance.


Sometimes a subject such as evolution is not understood by the speaker but may be well understood by many others, such as scientists. Of course, evolution is not a theory of chance, and has well established mechanisms underlying it.

Even when a subject is not well understood (i.e., the origin of the universe), that is not sufficient grounds for assuming an unproven answer like "God did it". Since the "explanation" of God is more complex than the entities that are purportedly explained by God, introducing God without evidence is simply begging the question.

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