Well, there are no such thing as atheists, IMO. Agnostics, yes. Atheists, no.
Many folks answer "belief in God" from a reflex of their upbringing.
Personally, I am uncomfortable with the ideas of both adamant atheists (so-called) and adamant theists for roughly the same reason.
Atheists (so-called) think they have a definitive answer to one of humanity's oldest questions, yet they cannot answer a question like - what are the natures and types of life forms in, say, Andromeda. How they then manage to make the leap to a definitive answer about God is beyond me....
Theists (IMO) tend to anthropomorphize God, ascribing their own human characteristics. This ego-centric tendency makes God small. And I don't even think most realize they are diminshing the concept of God.
Also, when it comes to God - are they talking about a "personal/interventionist" God (the "I want a bike for Christmas" God)?
Or an impersonal God (Spinoza - this was what Einstein believed in when he said "He doesn't play dice with the universe").
Or something else...?