I don't think you should ask what *I* call someone who takes everything in the Bible literally, or someone who uses the Bible as a guide, but if you want to know the term that is *generally* used to describe such a person, it's 'fundamentalist' for both 1) and 2). You could also 'inerrantist' for 1).
3) 'Undecided'. I suspect you might be after people answering 'agnostic', but 'agnostic' doesn't mean undecided, it means someone who has decided that there is insufficient evidence to know for certain either way. An agnostic can be a Christian (or other religious belief) or an atheist.