My guess is, all children are born as Atheists.
Feral children that roamed with animals for the first several years of their lives knew nothing of religion or anything in common with human habits or beliefs. They were more like the animals with which they traveled.
THE BIBLES SAYS..
THAT GOD IS INHERENT IN EVER PERSON..
As a missing piece of puzzle ...there is a place for God in every baby when they are born...
When they mature to the place where this knowledge is revealed to them,
then they are aware of their need of response to Him.
The can accept,RECEIVE HIM.. or reject Him ...JUST HAVE YOU HAVE CHOSEN TO DO...
God's word says..
Rom 10:8 But what saith it?
The word is nigh thee,
even in thy mouth, and
in thy heart:
the word of faith,
which we preach;