Cavna, and several of the cartoonists he talks to, note the commonness of having the celebrity walking through the gates of Heaven or talking with St. Peter or something along those lines. And, sure enough, Gene Wilder's death earlier this week resulted in some of those as well...
I’m going to tell you what my religion is. Do unto others as you would have them do unto you. Period. Terminato. Finito. I have no other religion... I don’t believe in God or anything to do with the Jewish religion.So the notion of Wilder meeting with St. Peter makes no sense twice over! If Wilder didn't believe in God, he would never have pictured himself going to Heaven. But even if you want to assert -- against his stated thoughts on the matter -- that he was never fully atheist and held some portion of Judaism in the back of his mind, Peter was a New Testament figure and not a part of Jewish theology in the first place!
What the artist is effectively doing is superimposing their own religious beliefs onto someone else. The person who died was clearly wrong when it came to their religious beliefs, as the Christian interpretation of the afterlife is obviously correct. You see the same thing with all celebrity deaths. Regardless of what the person actually believed, there are inevitably cartoons of them going to a Christian version of Heaven. Muhammad Ali was a Muslim. George Carlin was an atheist. Steve Jobs was a Buddist. David Bowie was agnostic -- "not quite an atheist." They all had cartoons depicting them going to Heaven.
One could argue that the iconography of St. Peter at the gates transcends Christianity and is a well-known enough visual that many non-Christians get the basic idea. This makes sense from the standpoint of a cartoonist's basic job of using iconography to get ideas across quickly. But it also shows a disrespect for the deceased and, more significantly, for the loved ones of the deceased who know that the person wouldn't want to be associated with a religion they didn't believe in.
Flip the situation around for a minute as a thought experiment. If you're a Christian yourself, would you want to be remembered as stepping into Jannah? (We'll set aside the notion that non-Muslims aren't actually allowed in.) The theology says it's a literal paradise, but would you want people to think that was what happened to you after you died? Or what if you were remembered as having Chitragupta tick off your deeds before handing you over to Yama? Or your body was mummified and your spirit was brought before Anubis to be judged?
I could keep going, but my point is that you wouldn't want to be remembered as something you're not. Why wouldn't that apply to anyone who doesn't believe in God, Heaven, and St. Peter at the pearly gates? Why would you think it's okay as an artist to memorialize someone in a way that's flatly at odds with their beliefs? If you're trying to pay your respects to someone, doesn't that necessarily mean you should avoid disrespecting their beliefs?