Why is it that about every fundamentalist believer has no idea how the Bible came together...?

I wouldn't say that just about every atheist on the planet knows its entire history, but certainly more of them know than fundamentalists. Speaking as a previous fundamentalist, we were "taught" how the Bible came about... It's just not what everyone else knows by the evidence. Like most things, we were spoon-fed their version of history with no evidence while being told to ignore everyone else.