If there is no God, life is absurd. If no God, life is ultimately meaningless. That is, there is no point to life.
I'm not an atheist, but there are some atheists I admire for their logical consistency. Like Richard Dawkins, in what he writes here: "Nature is not cruel, only pitilessly indifferent. This is one of the hardest lessons for humans to learn. We cannot admit that things might be neither good nor evil, neither cruel nor kind, but simply callous--indifferent to all suffering, lacking all purpose."
Dawkins is correct, if there is no God. But if this universe is a "creation" then it has, by definition, a purpose. In fact, only if there is a Creator God does our life have ultimate purpose. Other atheists have recognized this, and have acknowledged that trying to find ultimate meaning and purpose in life without a Creator God is fundamentally misguided. Only if there is a Creator God does one's life make sense in the greater scheme of things.
*Meaning - having to do with fitness in a coherent context.
*Value - having to do with objective good and evil, right and wrong.
*Purpose - having to do with a goal; having a reason for something.
If God doesn't exist, none of these do, ultimately.