I find it weird that people keep calling the Post-Portal world Pure Lands
The IRL connection can obviously be researched on Wikipedia, but it basically boils down to a Buddha (they are many) creating Realms of their own to help practitioners to be reborn OUTSIDE the "Circle of Reincarnation" to peacefully find enlightenment.
Pure Lands are basically "Enlightenment Acedemy Realms", not afterlives in any kind of Christian sense.
Of course, MfD could simply call the first Realm people enter Pure Lands....but why?
They are a bunch of references to Buddhist terms that somewhat match their origin,
KAMEHAMEHA talking about a Cycle of Reincarnation,
He is quite confident that there is some form of actual "Cycle of Reincarnation". And Kei has made some references herself but she and Snowflake also used Pure Lands, so I just consider it as a mixture of ignorance and Lore they never shared.
Then there is Yuno's Story about the "King of Hell",
And the Shikamaru/Kei wedding,
The obvious part is that both Hagoromo and Yuno's story agree on most colours and names for the Paths. That could imply a number of things, but at least both versions being similar shows that something stayed consistent for whatever hundreds of years.
But I do want to highlight that in Yuno's "King of Hell" story and the general accepted Buddhist version of the "
King of Hell" as the ultimate judge of where your Soul is supposed to go is the same.
Then ther are some 7th Path names that might relate to Buddism:
First, the Mara Clan being described as Clan of emptation, subversion and misdirection:
While also having a name (besides the animal) possible referencing a Buddhist demon named
Mara who embodies similar properties: (A bit of a stretch I guess, but the Three Daughters have some semblance of this)
Second, Yamaraja the Porcupine Boss, is a name for the King of Naraka, (just google the Name)
Third,
Enma is another name for the "King of Hell" in Buddhism.
I am not trying to say that the afterlive looks like a Buddhist textbook example, but after all those references, ignoring a possible "Cycle of Reincarnation" when 6 out of 7 known Paths fit the standard Buddhistic cycle is kind of weird. And then sticking with the Pure Lands as the default "Afterlife Portal Name" when it doesn't really match seems wrong.
This doesn't mean that the world behind the portal doesn't turn out to be "THE" Pure Lands or "A" Pure Land. Maybe even from the Sage of Six Paths, maybe the place got corrupted. But it's mostly Lore from wherever, including canon that is extremely underdeveloped.