Is December 25 an important day in religions other than Christian?

December 25th isn't even an important date in Christianity. The first celebrated Christmas was just after the Roman Catholic Church in the 4th century was established throughout the Roman Empire. This, however, was not based on anything scriptural, it replaced a pagan festival to the Old Roman Sun god. Based on scripture, Jesus was actually more than likely born September/October time. So the date is not important, what is important are the events that took place around Jesus birth, December 25th is just the date that has been now globally set aside. I can't speak for other religions, but I don't think December 25th is important for anyone else.