But yes, if you are brought up without knowledge of a God or faith in a God then the default position should be that you do not believe in a God and I guess that would be the assumption you would take with you as a belief just as someone brought up in a faith would take a belief in God as their initial assumption.
But I would say that what is common for both is the fact that they do not know, what they have is their belief, even if non believers like to call it a lack of belief.
But how would I say I don't know?
God is just a label in my head. We can lear to speak another language to communicate, but without culture and context, it means nothing.
If you took out the label it's asking
Do you believe something exist that you hold no concept in your brain?
How would you not know or leave open there is a concept that had never explained and experienced?
God would have to be defined so I'd have something concrete in order to base my opinions on ..whether it exist or it could.
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Many nonbelievers have a concept of god thereby they can form opinions from comparing it to fairies to assuming believers think it's a man in the sky.
So they can be skeptical and say don't know....if they finally knew, they'd know what to expect.
Born atheists like myself don't have that. Without RF and My former friend I'd know nothing about god not near what it means personally.