Because it's not his birthday.
It's a pagan, sun worship holiday.
Quoting: Anonymous Coward 20281321 This, the masses are voluntarily yielding their spirit to SATAN under the worship of Nimrod. The day of the Most High (AHAYAH - God of Abraham, Isaac and Jacob) will be a day to be remembered.
"The real origin of Christmas goes back to ancient
Babylon. It is bound up in the organized apostasy
with which Satan has gripped a deceived world these
many centuries! In Egypt, it was always believed that
the son of Iris (Egyptian name for "Queen of Heaven")
was born December 25th. Semiramis also bore the title
"Queen of Heaven" - and she was Nimrod's mother.
Paganism celebrated this famous birthday over most
of the known world for centuries before the birth
of Christ."
-The Plain Truth About Christmas
by David J. Stewart | December 24th, 2005"Christmas as a pagan holiday traces back
thousands of years before to a man named Nimrod,
founder of ancient pagan Babylon."
-Christmas Unwrapped
From the History Channel
by Alan Mansager
"December 25 was highly honored and recognized
by Nimrod's supporters...Many centuries later
this pagan custom was "Christianized" as being
the birthday of Christ."
-The True Origin of Christmas and Other Holidays
Who Was Really Born On December 25?
The Gilead Institute of America"Lent, Easter and Christmas are of Babylonian origin."
-EASTER AND CHRISTMAS PAGANISM
2000 B.C. TO DATE
by Edward Stevens (1895-1966)"December 25th was celebrated as
Nimrod's birthday. Generally, all mankind
is fast asleep, dreaming this old Babylonian dream."
-The Story Of Nimrod,
As It Relates To Christmas And Easter
by Wilhelm J Wolfaardt