No, speaking of truth, December 25 is no the real birthday of Jesus. Yes December 25 is Christmas day but no the "earthly" birthday of Jesus. Our teachers told us about it before. The Church just made December 25 as His birthday because no one knew Jesus's real birthday. So, what the Roman Catholic Church did was that they suggest dates then pick which one is closer to Jesus's real birthday out of insufficient evidence. Eventually, they agreed to make December 25, as Christmas day and birthday of Jesus Christ.