IIRC very similar takedowns have been made when it comes to our modern conceptions of pre-Christian "pagan" beliefs in Europe.

In 5th Century BC Greece "Hellenic Paganism" was not really "a thing" it was a fluid mix of local cults and traditions with a occasional systemizer like Hesiod trying to lay some order on the chaos of cults and myths. Only when the traditions were starting to die in the face of a rising Christianity did people, like the Emperor Julian, start to organize the many traditions and cults into "A Religion".

Similarly with Norse paganism, which was only systemized into "a thing" when it was already dead as a living tradition in the 13th century by Snorri Sturlison. And by the time the Norse converted their beliefs had already been strongly influenced by Christianity, Ragnarok, the Norse "Apocalypse" being a good example of this.

In fact, I would argue that it is the Abrahamic and related creed-based religions are the odd ones out from a comparative perspective, with "Pagan" fluidity being the norm.