Out of Context
Have you ever considered the fact that certain song lyrics, when heard out of context, actually sound like the titles of horror films?
"The Hills Are Alive"
"Hello, Darkness, My Old Friend"
"The Night Has a Thousand Eyes"
Those are just three examples. I'm sure there are more.
But that's not the point.
The point is that these lyrics come from songs so far removed from the horror genre that it's laughable to think of them in that context; and yet, without a working knowledge of these songs, you really would have no idea based on these little snippets that they were never intended to be scary.
Something similar happens when people with little knowledge of the Bible mine its text to support their own agendas. They start with their premise already worked out, and then sift through the text looking for verses to shoehorn into their arguments.
Without examining each passage's context--without considering who's talking, whom he's talking to, and what he's talking about--without regarding the literal reading of the text in light of the historical context, the grammar of the original language, the literary genre of the book, and how the interpretation fits in balance with the rest of Scripture, there really is no telling what someone will come up with.
The bottom line is that if you don't consider the context, you really can convince yourself that the Bible says almost anything; and if you're a Christian not properly grounded in the Word, you could be the next one taken in by heresy.
And that's really scary.