a person who disbelieves or lacks belief in the existence of God or gods.
"he is a committed atheist"
synonyms: nonbeliever, disbeliever, unbeliever, skeptic, doubter, doubting Thomas, agnostic; nihilist
"why is it often assumed that a man of science is probably an atheist?"
The best definition: https://www.atheists.org/activism/resources/about-atheism/
We had a poster claim that they were a nonatheist on their profile then become indignant when called a believer.
Either you are an atheist a person described by "the best definition" or you are not. If you are not, then you believe in some supernatural power or deity. There is no other option.
When one states that they are a nonatheist or not an atheist, they are in fact claiming that they hold some belief. It couldn't be more simple than that.
Please read in full the "best definition" definition. For those of you that don't know or don't understand this will clarify things.
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