Are we all born atheists?
Not sure that it matters unless you have an atheism fixation!
Yes, babies don't come out crying hallelujah, they have to be trained to be idiots
Tough question. On the one hand, we are certainly all born with no concept of a deity. On the other hand, we do also seem to have a natural inclination toward magical thinking and cognitive biases/shortcuts.
Maybe it would be better to say that we are all born as little sponges - ready to soak up all sorts of stimuli and information, both good and bad.