Ultimately, high theology and high philosophy can only answer the question “What is God?” with the answer of a newborn baby, “God is the wholeness of everything.”
The mystical writings say things about God that every child knows.
In the words of the Zohar, “God, You are the completeness of everything.”
The understanding of God as “the completeness of everything” is quite simple, and it is not an anthropomorphic picture of God.
It is not an image that people can visualize.
This understanding is so close and integral that it is almost invisible.
On the other hand, it is a very abstract notion, and difficult to express in words.
Children are usually too young to articulate their belief, and by the time they develop consciousness and language, they can see the world only as disjointed pieces.
Perhaps earlier, the child understands the oneness, and if no one spoils that belief, he will have it, wherever and however he lives.
The secret of belief is not to expect to see miracles, or to have grand mystical experiences, but rather, to preserve the innate notion we are born with.
Instead of adding, we have to edit out so many extra, useless words and ideas.
If we can come to the core, and carefully develop the very fundamental points of our minds, we may discover that God has always existed within us.
–Rabbi Adin Steinsaltz