The change is completely pointless, except to placate the politically correct crowd. The numbering of years is kept the same, but the terms are changed to avoid association with Christianity, and evidentily pretend like the numbering of years started arbitrarily. The numbering comes from the estimated birth of Jesus. For the sake of ease and convenience, the entire world has adopted the Christian calender, regardless of what religion or non-religion we all are, so why pretend otherwise?
If the politically correct crowd really wants to make a completely secular calender, then we'd also have to do away with the names of the months (Roman Paganism), having seven days a week (Judaism), and re-number the years by placing year 1 somewhere different than it is now (Christianity).