An important cue is that, while the word Hell or hell is always a noun, when used as a proper name, to reflect a real place, like Heaven, Hell is capitalized. Those who use it in lower case subconsciously try to strip it of that distinction.
Often the biggest critics of the ideas of Heaven and Hell are the Jews, who recognize neither as real places, only as vague abstracts. Because recognizing Heaven and Hell as real is uniquely Christian, though it bears some resemblance to similar evil domains in some other religions.
In this case, a “progressive Christian” is almost an oxymoron, equating Christianity with socialism, and such people even see God and Jesus as unnecessary to their faith, which puts mankind at the center of the universe.
I'm glad you noticed and commented on that. I almost "corrected" the title when posting this to capitalize the H, but thought against it as it does help to reflect the author's obviously skewed perspective.
“Often the biggest critics of the ideas of Heaven and Hell are the Jews”
Wrong. Hell is taught in the Talmud.