When we are children, we have a child’s view of God. A big bearded man in the sky with a benevolent smile, a beard and sandals. Maybe a maternal godhead, embracing us.

We imagine God as our idealised parent, fulfilling all our needs, giving punishments and rewards, guiding us to do right. We see the world as children because we have no other reference point.

Then, we become teenagers, and our worldview shifts. Suddenly, we are able to question authority, push boundaries, and assert our own independence.

We go through growth spurts, physically and emotionally. We close the gap in height with our parents so that we can see over their shoulders. They are no longer demigods, but imperfect human beings that we can challenge.

At this point, many of us give up on God. The childlike view we once had cannot hold, because the view we had of our parents has altered too. We realise that, if we can challenge authority, we can push back against the ultimate force we had imagined too.

I fulfilled the stereotype of a rebellious teenage atheist. I rejected the sky-daddy and all the nonsense of religion. This was a pretty lacklustre rebellion to my parents, who were themselves Marxist atheists.

I don’t remember the moment I stopped believing, or when I started again. But when I came back to faith, the beliefs I held were not the same as when I had been a child. I had to reconstruct God.

I took snippets from Jewish tradition. I listened attentively to my friends who were Quaker, Baptist, Muslim, Sikh, and Catholic, finding the parts that resonated. I reimagined what it would mean to believe in God if the Divine Parent surrounded by clouds no longer existed.

I realised that many others had engaged in the same thoughts too. All the while, when grown-ups had been talking about God, they hadn’t believed in the primary school version either. They had also gone through that process of maturing, and their ideas had developed with them.

It turns out that the God that atheists don’t believe in, the religious don’t believe in either.

This week is the Israelites’ coming of age.

Throughout Genesis, we only knew the God of stories. God created the world; God made people and gave them special purpose; God gave out punishments for wrongdoing and rewarded the good.

Now, we find ourselves in a situation in which we must rebel. We enter the Book of Exodus, where the Israelites are enslaved and forced to do hard labour. They are beaten and abused. Meanwhile, all around them, the Egyptian empire and the social order on which it is built are crumbling. We cannot believe in their gods, and we cannot find our own.

Our hero, Moses, sees through the nonsense. He stands up against his father’s power in the royal palace. He beats a slaver to death. He breaks away from the only regime he has known and runs into exile.

In the years that Moses ran away, he had to give up on all his old beliefs. The fantasies he’d held about his family. The dreams he’d had about what his own life meant.

He married a woman of a different tribe, Tzipporah, and worked for her father, Yitro. They were Kenites, and Yitro was a Midianite priest. Perhaps Moses could just have substituted his old beliefs for the Midianite ways. He would have simply worshipped a new pantheon of gods and taken on different customs.

Instead, Moses is forced to reimagine God altogether.

While tending his flocks, Moses meets his Creator in a thicket on a mountain. He sees a bush on fire, but not burning, that calls out to him and demands he remove his shoes.

Could this be one of the gods of Midian or Egypt? Could it be one of the spirits that inhabited the ancient world?

Moses must know. He asks “who are you?”

The voice from the burning bush replies: “אהיה אשר אהיה.” I will be what I will be.

This God does not have a name. It is not one of the idols that the nations worship. It is not something that can be held or controlled. This God will be what it will be. This God is the sum total of all that will ever exist.

When I teach bnei mitzvah children portions, I try to get them to understand what they are saying, so I teach them the roots of Hebrew words. They learn what is going on in each word of their parashah.

In Hebrew, every word has a root: three letters that hold all the possible meanings. Words like kaddish (the prayer for the dead), kiddush (blessing the sabbath), and kiddushin (getting married) all have the same root: kaf-dalet-shin. The root gives us all the words to do with holiness and making things special.

In nearly every parashah, we get to the unpronounceable name of God. The students nearly always try to pronounce it, but find it quite impossible.

We don’t say the word as it appears, but substitute it with “Adonai” (my Ruler) or “Hashem” (the name). That way the name stays sacred, or kadosh.

And then I teach them the root of this ineffable name. Hashem is a composite of three words: היה (what was); הוה (what is) and יהיה (what will be). God’s root is existence. God is the thing that always exists, and from which all existence comes.

When God says “I will be what I will be,” it means that God is everything. God is existence itself. God is whatever it means for something to actually exist.

This is the mature view of God. It is not a fairytale or a Santa Claus. It is a way of understanding all of reality.

This God will not do what it is told, or sort out your problems for you.

That’s why this God comes with a demand. “Go back to Egypt. Get over there and bring the people out of that land. Do whatever you can, bring everyone with you, and get yourselves free.”

When we are children, we have a child’s view of God. One who gives out punishments and rewards. One like an ideal parent.

Now, we are faced with the good of adulthood. The one who is the foundation of all existence. The one who gives all life meaning. The one who says: “I am not going to free you by magic. You will have to start freeing yourself.”

Shabbat shalom.