Similarly, if one lived all one's life in a rationalist bubble, and never even heard the mention of God or gods or religion or the supernatural, then perhaps one could not have an opinion on whether God exists. But that applies neither to you nor to Dennet.
How would I know that my disbelief in Thor is wrong? At a first cut, I'd need to have someone propose a more concrete proposition to evaluate; then I could try to evaluate it. But whatever that proposition is, it would need to be able to accommodate all that we've learned about the world and about science; it would need to be falsifiable; and it would need to explain the world in a more satisfactory manner than the alternative worldviews.
