I think its because of they're religion I'm not sure so type an answer for me please

In 1951 the Watchtower stated the Witnesses were no longer to celebrate birthdays.

Is it proper to have or attend celebrations of birthday anniversaries?-F. K. Nevada. Such celebrations have their roots in pagan religions, and not Scriptural grounds. Some Bible commentators suggest that birthday celebrations may have had their origin in the "notion of the immortality of the soul." Watchtower 1951 October 1 p.607 Questions from Readers.

Historically birthdays are not celebrated, In the days of Jesus, birthdays were not normally celebrated. They were not celebrated in the early Christian Church

Hi,
This will help you to further understand why Jehovah's Witness do not celebrate birthdays.


Birthdays: The only two birthday celebrations spoken of in the Bible were held by persons who did not worship Jehovah. (Genesis 40:20-22; Mark 6:21, 22, 24-27) The early Christians did not celebrate birthdays. The custom of celebrating birthdays comes from ancient false religions. True Christians give gifts and have good times together at other times during the year.

What this is saying is the celebrating of birthday's comes from false religions. False religions do not please Jehovah God. Also the two birthday celebrations recorded in the Bible were not good and were very displeasing to Jehovah God. You can conclude that Jehovah God put those in there to warn us about the celebration of birthdays.


Beliefs and Customs That Displease God - Jehovah's Witnesses Official Web Site (http://www.watchtower.org/e/rq/article_11.htm)

... and in true cultist fashion they read into things that were not meant to be read into.