Religious.
A person who believes in aliens is often referred to as an "alien enthusiast" or someone who is "believes in extraterrestrial life."
A creationist.
I would call him a god, or at least someone who believes he is a god.
magician
Lonely!
A Sun reader.
A Marxist
Monotheistic, or a monotheist.
a jackass unless its a proper approch
A Blasphemer. You are not Jesus and saying you are is called "Blasphemy"
someone who believes they always have an illness and are dying even though theres nothing medically wrong
an atheist is someone who doesn't believe in a god.