God had said to those people released from slavery but still living in the wilderness, "You shall have no other gods before me. You shall not make for yourself an idol."
Was is easier for them to focus than it is for any of us? How free are we? Do we consider our surroundings more like a promised land or more like the wilderness?
"No other gods. Don't make an idol." That's the first commandment, the starting place, the first step in preparing to live the new life--or to live life in the new way.
What a god is--the most important factor that we base a decision on. Our god can be our physical safety (or merely comfort), or our financial security, or our need to feel superior, or so on. What influences what we do every day? What is important to us? Whatever that is, that is the idol we have made for ourselves.