Llamatron, you posted "How do you cope knowing that ultimately your life is meaningless and our continued existence pointless?"
I would say that my life is full of meaning .... but the meaning it has is defined by me. And in the end, it comes down to love... love of family and friends, love and awe at the marvels of the universe, love of the material... good food, good entertainment, good gadgets, good clothing, good sex etc, love of new experiences, new people, new challenges and constant, neverending learning.
In fact, the only thing I think that is different between a theist and an atheist on this issue is that a theist thinks that it all comes from divine interference. Or are you saying that the only thing that gives life meaning is a personal awareness of some divine principle or being?
As to the pointlessness or otherwise of life... Life itself is the point... I stand in awe at the way it evolves and adapts to fill new niches.... from the challenging environments found at the top of mountains or the bottom of the sea, right through to highly specialised niches filled that you see in the most fecund, such as tropical rainforests.
To me, it would seem to be the fundamentalist religious types who think life now is pointless... witness the suicide bombers, or matyrs for the cause that religions have created over the centuries.