That's quite an interesting claim. On one hand, yes - everything that anyone writes down is a work of fiction because they're telling an account of something, whether it's a story, or their recollection of an event that took place, or the recollection of what someone said took place. On the other, the Bible's a largely accurate representation of very old documents, which themselves were written in some cases by the people involved, or passed down through oral history through not all that many generations before being written down. So in some cases the Bible's representation of a letter that say St Paul wrote, is in fact not at all fiction, but really the letter he wrote. Likewise it contains various peoples accounts of things that happened - whether you believe their accounts is one thing, but it's harder to deny that the Bible makes a fairly accurate attempt at portraying those accounts (as far as historical documents that old go).
To try and read the Bible as one simple textbook would be to misunderstand how it was physically and historically created.
That's an opinion that's come up before, and I highly disagree with it. Bad people do bad things, and will use any tool and excuse for it that they have available to them. Wars have taken place on many grounds, religion is one, but territory, race, family, culture, gang whatever are at least as frequently the cause. People fight when they have differences, and religion is but one.
Ideology, arguably, but not religion.
In fact most religions could even claim to have a beneficial effect on society.
That worked so well for the athenians