Is contemporary atheism sufficient to sustain a civilisation?

[Anomalocaris]

No, atheism is not enough. It is also not even essential for sustaining a civilization on a scale of perhaps a few thousand years. But it is helpful for producing and sustaining further and faster progress, and keeping human civilization a few steps ahead of those truly global natural calamities that we know visits earth over time scale of tens of thousands of years, which otherwise would have the power to eradicate civilizations if not the humanity itself.