In this article, I find the following paragraphs:

The 1970s and 1980s were the point at which the long arc of traditional liberalism gave place to an avowedly illiberal, mechanical ‘control system’ (managerial technocracy) that today fraudulently poses as liberal democracy.

Emmanuel Todd, the French anthropological historian, examines the longer dynamics to events unfolding in the present: The prime agent of change leading to the Decline of the West (La Défaite de l’Occident), he argues, was the implosion of ‘Anglo’ Protestantism in the U.S. (and England), with its entailed habits of work, individualism and industry – a creed whose qualities were held then to reflect God’s grace through material success, and, above all, to confirm membership of the divine ‘Elect’.

Whereas traditional liberalism had its mores, the decline of traditional values triggered the slide towards managerial technocracy, and to nihilism. Religion lingers on in the West, though in a ‘zombie’ state, Todd avers. Such societies, he argues, flounder – absent some guiding metaphysical sphere that provides people with non-material sustenance.

It’s a bit strange: The author (Alastair Crooke) points to Todd’s hypothesis of “‘Anglo’ Protestantism” being the “prime agent of the Decline of the West”, but in the following paragraph mentions “the decline of traditional values”. It’s not clear from the article whether the latter statement is Crooke’s or Todd’s.

In any case, I would contend that Protestantism (not ‘Anglo’, but ‘Calvinistic’, e.g. Puritanism) indeed “entailed habits of work, individualism and industry – a creed whose qualities were held then to reflect God’s grace through material success”, this actually being good things. It led to the Industrial Revolution and so to the blessing of drastically reduced infant mortality and better quality of life for nearly everyone.

The other part of that sentence, namely “above all, to confirm membership of the divine ‘Elect’” indeed points to something more problematic. It’s true and will have led, due to human fallibility, to “elitist” attitudes. However, in a healthy Christian environment such attitudes would have been tempered by the commandment to “love thy neighbour as yourself”.

The loss of the faith in God led to the loss of the power of this commandment within society and therefore to “the decline of traditional values”.

So, it’s not “Protestantism” – of any flavour – that led to the “Decline of the West”, but the loss of faith.

What was retained was the belief in the ability to be somehow part of an “elect” group who are somehow “better” than most other people and therefor have a right to lord it over them – uninhibited by divine commandments.

That attitude led to fiat money, the welfare state, state schooling, both World Wars and the subsequent “Decline of the West”.