I have been at the same job here for over 20 years. So when I was the cult they all knew my stand and respected it. They celebrated everyone's birthday except mine. They went ahead and had birthday cakes, sang "Happy Birthday" in the employee break room while I stayed at my desk and worked. They saw that it did not bother me; they were OK with it. After I left the cult - I think it's been 11 years now - they went all out for my first birthday. They had a huge cake - something better than what they normally have for anyone else - and lots of cards. Even the family members of the owner came. Afterward I sent everyone a thank you email and explained that I learned something from them. The WT teaches that birthday celebrations honor the person; this is not completely true. It is not a form of "worship". I learned that birthday celebrations are an opportunity to express appreciation for that persons individuality. What things are unique about that person that you appreciate. If the person likes dogs, they will usually get a birthday card with a dog theme/picture. If the person likes music, the card might have a musical theme, a picture of a piano or something. Those organizing the celebration put thought into which card to select, what kind of cake, and so on. So the birthday celebration is a way of telling the person, "Thank you for being you. We are glad we know you."
And now, I enjoy celebrating EVERY holiday. At work for Flag Day (June 14) we all wore red white and blue ( or at least one of those colors) and had treats in the break room, on red white and blue plates. For St Patrick's day we all wear green; red for Valentine's Day, and so on. I and other men have those crazy flashy socks for each holiday. Everyone has a good laugh. We bring in treats or doughnuts or bagels, cookies, brownies etc. We even did stuff for Cinco de Mayo. These are all just "good clean fun"; we are not worshipping anything or anyone, we are not having any kind of fertility rituals or invoking false gods to bless our work.