It actually is losing holidays; if you have the same number of holidays per year, but more total days per year, you are losing holidays.
As opposed to "Holidays" meaning days like Easter/Christmas/New Years/etc.
> A slippery slope, the clergy warn, to forgetting the fasting month of Ramadan altogether; the authorities are rewinding the clock to the jahiliyyah, or pre-Islamic age of ignorance.
This seems to indicate that larger issue is the fact that the current calendar is inextricably tied to Islam, whereas the new calendar is secular at best, or the tool of a different religion at worst.
I honestly would prefer something based on a shared solar event. The Crab Nebula and supernova in 1088 ACE would be a good neutral place, as would other events, like Halley's Comet.
It would be secular, and sold to the world as such. But it would put the focus on solar events, in which any number of peoples can use as an omen for their local system of religion and symbolism. Can't win everything here, but neutrality is certainly a laudable goal.
(Edit: wow, quite a bit of -1's, and no real good reason why. I was hoping for a good neutral dialogue, rather than bemoaning current date systems. And also, it may have been Pope Gregory. It still is bound to the Catholic church.)
[0] https://en.wikipedia.org/wiki/Gregorian_calendar (edit: typo caused me to credit the wrong Pope.)