Do atheists believe in the existence of friendship?

[Nay_Sayer]

So, you think just because I didn't mention the word 'trust', I don't think it is part of a good friendship?

Just because I failed to mention it, does not mean it is not part of a good friendship. You did notice the part of my post where I said, "etc, etc, etc", right? Thinking of every possible sign of friendship between 2 people, while I was at work, was not on the top of my mind when I posted yesterday.

How did you come to the conclusion that trust is not a product of brain chemicals?

Please google, "the brain chemistry of trust, or the neuroscience of trust:, or similar phrasing. There are plenty of scientific articles about this very subject.

But specifically, it is dopamine, serotonin, and oxytocin (mostly oxytocin) responsible for trust.

In this case, I bet those who can have these chemicals in their body are rare on earth.
Let us start from this forum and see how many couples trust each other really. It will be great news if we find one couple.

Do you think these chemicals let someone trust blindly another person?
Or perhaps, after someone starts to trust to no limit a person, his brain, in turn, starts synthesizing those chemicals to protect his trust from fading with time.

Truth be said, I am an atheist, speaking science because I believe in my science only and let the world's science to others (Sorry, this a big topic but I liked you know that I can't believe/trust blindly what may be provided as being special discoveries on any media).
.

 Then you need to do better.  Both in your application of understanding science and communication.