Way more common stance is 'There is no evidence for a God, so I see no reason to assume that one exists.' Even Richard Dawkins is the latter sort of an atheist.
That's not Atheism, that's Agnosticism.
Not sure how you can say the difference is vague between absolute Certainty and Uncertainty?
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?