The real difference among white people is not between college-educated and non-college educated, but instead between members of fundamentalist or evangelical churches and those who are not. The college/non-college distinction is that Christian fundamentalists and evangelicals are less likely to complete a college degree.
Consider the anti-intellectual culture of most fundamentalist and evangelical churches. People who accept biblical inerrancy to the extent of accepting young-earth creationism and a literal worldwide Flood likely have little interest in college-level learning. They might attend bible schools whose degrees aren't worth the fake parchment on which they are printed and drop out.
The real difference is between who white voters who
identify as evangelicals and those who do not. In the northeast, actual members of evangelical churches are outnumbered by Catholics and Cultural Christians, but many Republicans in the latter category would say they're evangelicals.
