Is atheism a belief?

[Belacqua]

There are all sorts of non-reasoned determinants ... emotional, unspoken, unrecognized, partially recognized etc.
Do people fall in love with their partners due to "reason" ? Valuing reason is itself a criteria. Have you demonstrated it's a good one ?

Good! 

Yes, there are all kinds of reasons people have for reaching their conclusions. Many of these are, as you say, emotional or unrecognized, etc. 

So it's important for us to recognize that our current conclusions may be based on these reasons. A person's atheism may be based, not on nothing, but on unrecognized emotional causes which aren't really thought out.