A person who believes in aliens is often referred to as an "alien enthusiast" or someone who is "believes in extraterrestrial life."
A creationist.
Religious.
I would call him a god, or at least someone who believes he is a god.
Lonely!
A Sun reader.
A Marxist
Called Muslim
Monotheistic, or a monotheist.
No. Islam believes in monotheism.
the quran
Islam believes in One God (Allah).