Probably not mentioned enough because "Atheists are more educated" sounds like a rather prickish argument, especially because it does nothing to answer of whether there is a deity or deities. When "liberals are more educated" comes up, I mention that libertarians are generally even more educated because that is true, but that doesn't make my political philosophy "correct." Same with divorce. It's like saying that social conservatives are better people because they donate more to charity as a percentage of income.Well, there is an mostly non-debated connection between atheism and education, so I'd imagine income levels are similarly, on average, higher for atheists (obviously, education connects to income level too).
Atheists do seem to have lower rates of divorce than Christians, however.