New Recurrent Topic

I am beginning a new recurrent topic to go along with all the others: Differences Between Protestants and Roman Catholics/Orthodox: We are all Christians but there are some very real differences in attitudes and beliefs between us.  The unity of the Mind of Christ, the ἐκκλησία, unites us even if we may never be united on a human, organizational level.

http://www.allaboutjesuschrist.org/was-jesus-born-on-december-25-faq.htm

A difference between us which is relevant for this time of year is the celebration of Christmas. Protestants and Catholics celebrate Christmas on 25 December while Orthodox observe the holiday on 7 January.  Biblical scholars and historians are almost universally agreed that both of these dates are incorrect.

The biblical and historical evidence points to the birth of Jesus having occurred in March or April of 6-5 BC/BCE.  Calculations by other scholars point to Jesus having been born in September or October.  The birth could not have occurred in 1BC/AD because Herod died in 4BC/BCE

About the 25 December and 7 January dates: Orthodox follow the Roman Julian calendar which was in use at the birth of Jesus while Protestants and Catholics follow the Gregorian calendar (Pope Gregory XIII, 1582) which corrected an error caused in dating because the year is not exactly 365 days in length. 

The 25 December date was first suggested by Sextus Julius Africanus in 221 AD/CE and was celebrated on that date as early as 354, but it was not officially declared as the date until 440.