The difference is that if you want to talk about “market fundamentalism” without sounding derogatory, you can simply call it “libertarian free-market economics”. “Militant atheism” lacks an equivalent term, and considering the prevailing opinions on LessWrong assuming that it is being used as an insult is rather leaping to conclusions, not to mention uncharitable and, as it turns out, wrong.
The difference is that if you want to talk about “market fundamentalism” without sounding derogatory, you can simply call it “libertarian free-market economics”. “Militant atheism” lacks an equivalent term, and considering the prevailing opinions on LessWrong assuming that it is being used as an insult is rather leaping to conclusions, not to mention uncharitable and, as it turns out, wrong.