Public schools are secular by definition. They are required by law to give children a secular education. Public schools, as an extension of the government, do not have the right to indoctrinate children into religious beliefs, nor do they have the right to teach atheism.
QFT.
I find it amazing that some Americans are so ignorant of their history as to totally misunderstand the driving purpose and reason for the way that the USA was setup in the first place.
I think archaeologist does not want to know the real reason that the USA is secular, because it might just make his head implode. The very idea that the self-same evangelicals who ultimately spawned him wanted to escape a non-secular christian country!
But to be more on-topic, the atheist isn't "obsessed" with the bible. Many of them became atheist (or agnostic) without reading the bible at all (although many have read parts). There are, however, those who have actually read the bible and, with new eyes not blinded by faith, start to see...problems with it.
It's stance on women, on human rights, on punishment, on laws and prohibitions. Its wildly inaccurate nature (this one for those who daydream of it being "infallible" in the scientific or historic sense), its fanciful nature (talking snakes and donkeys! people wandering around in the desert and having their heart cut out!), its lack of internal consistency (did Judas die by hanging? or did his guts explode? did he waste the silver or spend it? or save it? was jesus born 4BCE or 1CE?).
the atheist can actually read the bible (and indeed, many former xtians have read the bible, and reading it lead to their apostasy) and take a horrified look at this wanton self-deception of the majority of people who make laws around it, celebrate it and proclaim it to be the last word in truth, forever.
Those atheists aren't obsessed with the bible but aghast about it. Almost every single one is saying "but, but...haven't you actually READ it? Can't you see what's up with it?"
™ Version 4.2