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A person who does not like humanity may be called misanthropic or misanthrope.
A person who believes that war is wrong is called a "pacifist".
Christian??
A person who believes in their dreams can be referred to as a dreamer or an idealist.
A statement that tells what a person thinks or believes is called an opinion, sometimes known as a belief.it is known as a belief
Pacifist
In general, such persons could be called believers.
This is called an opinion.
They are called an Anarchist.
Contrapositive
Emerson would likely describe such a person as "transcendental" - someone who believes in the inherent goodness of humanity and is open to receiving new wisdom and inspiration from the universe.
Agnostic