Re: Celebrating Birthdays!
Peace akmoti,
I think its more related to cultrual rather than to Islam. For example, Quaid-e-Azam day is marked and official holiday is also observed on this day/date. Its has nothing to do with religion Islam. If we read the history than we’ll know that its common in every culture and was celebrated due to various reasons. Read more about birthday celebration at: Birthday - Wikipedia, the free encyclopedia
So simple is that we will not found any reference where birthday was celebrated by Prophet Muhammad :saw2: or by any of His :saw2: companions. Moreover, it is written in that link provided in your post that “Whosoever imitates a nation is amongst them”. So why we do something which was never done by our Prophet Muhammad :saw2: or by any of His :saw2: companions.
Peace hareem,
Islam also doesn’t promote it.