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The existence of the universe depends on every atom doing exactly what it is supposed to do set by observable laws. But why?

There are no observable laws. There is observation of regular, predictable behavior. The summing up and description of these observations are called natural laws, but they control nothing; they direct nothing. Their accuracy in predicting future behavior depends on the accuracy with which they were initially formulated and the intelligence and depth of knowledge of the one using them to make the predictions as applied to circumstances perceived to be similar. The behavior depends entirely on the inherent nature of the observed phenomena not the description of it, though our description of it includes our own interaction with it.