Usually, a doubting Thomas, (Biblical)
In general, such persons could be called believers.
Nihilist
A person who believes that war is wrong is called a "pacifist".
Christian??
Well ! If some person believes that his/her dreams do come true, means he believes he/she has the ability to perceive events in the future is normally called Clairvoyant.
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
This is called an opinion.
Fate means Noun:The development of events outside a person's control, regarded as determined by a supernatural power.Verb:Be destined to happen, turn out, or act in a particular way: A person that believes in fate has no special name or term to be called by. It is merely a description of how the person excepts events that happen to them in their lives.
They are called an Anarchist.
Contrapositive
Agnostic