Why did Origen oppose birthdays? Was this a Jewish belief?

I found this quote of Origen condemning birthdays as the practice of the gentile sinners . > **...of all the holy people in the Scriptures, no one is recorded to have kept a feast or held a great banquet on his birthday. It is only sinners (like Pharaoh and Herod) who make great rejoicings over the day on which they were born into this world below** (Origen, in Levit., Hom. VIII, in Migne P.G., XII, 495) (Thurston H. Natal Day. Transcribed by Thomas M. Barrett. Dedicated to Margaret Johanna Albertina Behling Barrett. The Catholic Encyclopedia, Volume X. Copyright © 1911 by Robert Appleton Company. Online Edition Copyright © 2003 by K. Knight. Nihil Obstat, October 1, 1911. Remy Lafort, S.T.D., Censor. Imprimatur. +John Cardinal Farley, Archbishop of New York). The writings of the late third century Catholic theologian Arnobius show that, even that late, Catholics objected to the celebration of birthdays as he wrote: > ...you worship with couches, altars, temples, and other service, and by celebrating their games and birthdays, those whom it was fitting that you should assail with keenest hatred. (Arnobius. Against the Heathen (Book I), Chapter 64. Excerpted from Ante-Nicene Fathers, Volume 6. Edited by Alexander Roberts & James Donaldson. American Edition, 1886. Online Edition Copyright © 2005 by K. Knight). Can you quote the full context of Origen (and Arnobius) quotes, and any responses or discussion on this view by others, within the third century in English and Greek? I need to know the reasons for his views. Background: >- The Encyclopedia Judaica could not be more blunt: “The celebration of birthdays is unknown in traditional Jewish ritual.” In fact, it says, the only birthday party mentioned in the Bible is for Pharaoh! (Genesis 40:20). *Birthdays, Jewishly * > >- History of celebration of birthdays in the West: > >“It is thought that the large-scale celebration of birthdays in Europe began with the cult of Mithras, which originated in Persia but was spread by soldiers throughout the Roman Empire. Before this, such celebrations were not common; and, hence, practices from other contexts such as the Saturnalia were adapted for birthdays. Because many Roman soldiers took to Mithraism, it had a wide distribution and influence throughout the empire until it was supplanted by Christianity.” > >“Christmas is also relevant because December 25th was the day of celebration of the birthday of the sun-god Mithra. Perhaps it should also be mentioned that one of the key features of Mithraism was Sunday observance. The reason that this seems to be relevant is that the Roman Emperor Constantine, the first Roman Emperor to make a profession of Christ, was also the first Emperor to make Sunday laws–which he began to do on March 7, 321. Also, a few years later, the Council of Nicea that Constantine convened in 325 A.D. declared Sunday to be the “Christian day” of worship (for more information, please see the article Europa and the Book of Revelation).” *Pagan Origins of Birthdays *