A statue worshiper
Believing in more than one god is called Polytheism. Such a person is a Polytheist.
A lunatic.
Such a person is a monotheist.
Not really sure what you mean, but if you were referring to a person who worships, you could call them a "worshipping fool, worshipping person etc.
If they are Christian statues, Christians generally call them icons. If they are non-Christian statues, Christians generally call them idols.
a person who worships the devil
an idolater
He / She is called a Believer
People who build statues are usually sculptors
cosmologist, I think
A bibliolater is a person who worships books, especially the Bible.
a JEW, a person who follows Judaism, worships in a temple.