The title should read: "Saudi Arabia adopts the Gregorian calendar in paying government employees." According to arabnews.com, this brings the public sector in line with how the private sector is already being paid.
So no, they won't be "running the state" based on the Gregorian calendar. Ramadan will still be observed in the month of Ramadan.
And how is the decision not to award employees 11 extra days' pay because of an administrative change a case of "globalisation favouring rulers at the expense of the ruled?" Just a year ago, when the king awarded all the employees bonuses, wasn't the Economist accusing him of trying to buy his subjects' loyalty? He can't win, it seems.
As for the Wahhabi clerics complaining of a "slippery slope," who are they? And what is the technical term in Arabic they used that translates to "slippery slope?" To claim that any official cleric in the Kingdom would speak out openly against the ruling family is, frankly, ridiculous.
All of this article is utter stupidity, as if the author read half of a headline in an Arab paper and extrapolated it to mean the conversion of the entire country to Christianity.