We are a predominant Christian nation so we became accustomed to BC and AD. Back in the Seventies when I started reading something other than Zane Grey and Leon Uris (Still love their books) I came across BCE and CE. In academic books especially historical text CE and BCE have been the norm long before I attended college. If BC and AD are used the author is most likely a Christian.
Fact is Churches are losing young people in droves, despite anecdotal stories of revivals. Non-Christian's do not use BC and AD, so BCE and CE are more in use. Blame it on the schools, blame it on Governments, blame it on Satan, blame whomever, but the real blame lays with Churches and denominations. Instead of worrying about some letters in common use for over 200 years, focus on the greater problem, apostates posing as people of God.
Blame Canada!