Interesting, Lisa.
Actually, as you are well aware I am sure, the birthday celebrations mentioned in the bible in no way resemble those held by most sane folks today. I have never heard of anyone being beheaded at a modern-day b-day function. Also, no one that I know of has ever been 'idolized' by having their b-day celebrated. Most people have some cake and get on with their day.
To me, a nice, dignified b-day acknowledgement (or party, if you will), is not objectionable. I guess a case could be made against excess revelrie and some of the pagan trappings, but to me a simple celebration is not objectionable.
BTW, I have heard of some jw graduation parties that have had guests numbering in the HUNDREDS. Now, rhetorically, why don't they consider that as undue attention given to one individual? And yet, even a small b-day gathering is seen as possibly giving undue attention to the individual.