It sounds like the holidays that rotate around the year are Islamic Holy days though. Even countries that use the Gregorian calendar have holidays based on the Lunar calendar -- Easter for instance.

> 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.