To say 'I don't like tea' and 'I dislike tea' infers that they have tried tea and know what tea is.
Whilst there isn't commonly cause to differentiate, the two are not perfect synonyms. You can be in a position where you can't say "I like tea" without having tried it and decided that you dislike. "I dislike tea" is an affirmation of a position; "I don't like tea" is the negation of a position.
For someone who has never tasted tea they can't say either of these, only "What is tea?".
If you ask someone who has never had tea if they like tea they could well say that they don't know, but they could just as accurately (if less helpfully, with common usage) say that they don't like tea - you'd presume they dislike it, but that's not technically what they've said.
Your argument falls apart at this distinction because you make no account for those who have never tasted tea, and yet you craftily squeeze those who have no notion of gods into your second section as if this case has been covered in your first, which it hasn't.
No, the error is yours because you presume atheism to be a confirmed decision, when it is merely the characterisation of all those people who are not theists.
O.
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