Someone who believes in Judaism is called a Jew. This term can refer to both individuals who practice the Jewish faith and those who identify culturally or ethnically as Jewish, regardless of religious observance. Judaism encompasses a rich tradition of beliefs, practices, and cultural heritage.
The religion is Judaism. A person who follows Judaism is Jewish.
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
Monotheistic, or a monotheist.
Judaism
Judaism
The religion that believes in the deity Yahweh is Judaism.