nonbeliever
This term carries a neutral to slightly clinical tone, describing a state of lack of faith without necessarily implying active hostility toward religion. It is often used in theological or sociological contexts to categorize individuals based on their adherence to a specific creed. While it can refer to a general atheist, it is frequently used within a specific religious community to describe anyone who does not share that group's particular tenets, regardless of whether the person believes in a different god or no god at all.
Meanings
A person who does not believe in the existence of a god or gods.
"He was treated as a nonbeliever by the devout community."
A person who does not believe in a particular religion, doctrine, or set of beliefs.
"The professor remained a nonbeliever in the theory of spontaneous generation."