Although modern writers have created numerous subdivisions of non-believers, generally speaking:
There are several groups that meet this criteria.
If you mean no god at all there are:
If you mean the Christian god, there are:
If you mean a trinity of god as believed by some Christians:
agnostic? There are a few different spiritual beliefs that don't involve gods.
Non practicing
A scientific person :)
A person who believes that war is wrong is called a "pacifist".
A tolerant person.
conceited
Gullible.
Someone who doesnt give up and believes the caption "everything is difficult before its easy" will get far in life without a doubt.
One who believes that everything is predistined -FATALIST
A person who believes in their dreams can be referred to as a dreamer or an idealist.
Christian, Jew, Jehova
The religion is Judaism. A person who follows Judaism is Jewish.
This is called an opinion.
Celibatarian