alt Hacker NewsIt's not the only answer, but I would direct you to the Fundamentalist-Modernist Controversy.
Around a hundred, hundred and fifty years ago when our understanding of the universe had finally reached the point where it became obvious that (a) all of our creation stories were just stories and (b) we actually kind of knew the actual story now, everyone had a big crisis over how to deal with that.
The two options on the table where fundamentalism -- doubling down on Biblical literalism and faith -- and modernism, taking the Bible as more a spiritual message, adapting our understanding of it for the modern world.
Some churches went one way, others the other, but over the following century the fundamentalist churches have proven to be better at attracting, retaining and motivating their members.
There are still modernist churches, but the loudest Christians in America are almost all of the fundamentalist bent.
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Those unable or unwilling to expend cognitive effort love black & white thinking & are also easily swayed by emotional manipulation.
It doesn't help that they attract power hungry sociopaths who seek to influence them for profit.
Of course, the only way I can think of to address this would be for the state to violate the first amendment & promote the concept that anyone who believes in Hell condemns themselves to Hell. (Matthew 7:1-2)
One important bit of background to it is that people had been arguing (and it had been the accepted view) that the creation stories were just stories pretty much from the beginning. Augustine and Origen, for example.
I think the division your are referring to may be true of American evangelical churches, but its not true of Christianity globally. "Modernist" is not a good term for a view that has been around (and generally accepted) for most of two millennia.