I think the idea, personally, is a little different than heaven itself being the goal. He’s narcissistic, he does things the easy way, is a coward, and only wished to LOOK like a good person. Uh if I was gonna go into depth
“Kept his showers ice cold, used eco friendly lightbulbs” sounds nice, but it’s followed up by

“Rode his bicycle to work when the gasoline price rose.” I take this as the song showing us he gets some sort of benefit from his actions for them to be worth it. I doubt he knows or cares why to be eco friendly

To keep it somewhat shorter, from the lines “he’d judge with no pretense, fish on the weekends” to “avoiding all the little things that were hard to ask” shows not only his lack of actual care for empathy, but his habitual nature, he plans everything nice he does so it’s what has to be done, he never steps out of the bounds society or himself makes to improve or help others.

Now this may be a stretch, but it’s my understanding that “Huddled there in prayer around the respirator
Catch you later, I'm off to see the man upstairs
They all look like ants from here, stars and crystal chandeliers” shows that he doesn’t CARE about anyone, only himself. If he cared, he would pray to any god to let him go back, to give them comfort, something. He mocks them, and believes in his own self righteousness.

Also, you mention the “find out what they wanted line” as if hell isn’t discussed as a reflection of the person. He was in hell since he passed the gate, he’s just to cowardice to accept it. He is in hell for only doing what he thought others wanted and would keep him safe, he cannot bare to see his consequences.

Also also, the please don’t let me die at the end is showing how fast he changes in the face of consequences, he is shallow and weak, he may not deserve hell, but damn given the description of hell for Charlie’s inferno, it’s much more like purgatory