He was definitely not born on Dec 25th. That we know. The actual date is not certain either, but I think the year is pretty “certain” - 7BC. read more
It is also known that Jesus lived for 33.5 years and died at the feast of the Passover, which is at Easter time. He must therefore have been born six months the other side of Easter - making the date around the September/October time frames. Other evidence that December 25 is the wrong date for the birth of Jesus comes from early writings. read more