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There is no observable evidence for dark energy or dark matter. To postulate these is simply to fill in gaps in our knowledge of how gravity works. But that aside, if dark energy and matter were observed and proven to exist, these would be a part of, not in any way the cause of, our universe.
The problem for the new atheists is trying to find something outside of, or prior to, our universe.
The preamble to all of their statements is that God definitely does not exist, and so they have to look elsewhere for a convincing argument. So far they have failed miserably, and quite often rely on sheer nonsense to try and attempt a universe created without God.