The universe, which is like a giant clock could not be eternally winding down. The universe created itself. This is a contradiction. This is a logical absurdity. The universe came from nothing.
Nothing comes from nothing.
The atheist has no explanation for how life arose from non-life or how the personal arose from the impersonal. The atheist has no non-arbitrary way of declaring human dignity or value. Hence, the only difference between man and the animals is quantitative. Human value is a sliding scale. From the atheist perspective there can be no moral absolutes.