I'm no child, you already knew that, little one.<quoted text>No child. Agnostic is a person who believes that nothing is known or can be known of the existence or nature of God. BIG difference.
No child, an agnostic is someone who believes a God could or could not exist.
And whether Einsten believed it could be known or not, still proves that he himself with his great knowledge knew that a God could not be disproven.