This is because you do not understand atheism.
Exactly!
I'm not asking about the validity of theism or atheism. Let me put it another way. Let's say you're right. There is no God. No one really loves me because love is just a "a neuro-chemical part of our survival mechanism". There is really nothing to look forward to except old age then eternal death. No hope of anything more. Basically "Life sucks and then you die". How am I supposed to feel good about that? Is it supposed to bring me peace because it's "true"? It might also be true that I have an inoperable brain tumor but knowing that truth doesn't make me happy. I'm just saying that I don't get it. If it's true how are we supposed to feel happy about it? What perspective can I have about it that can bring me peace?