Only an Atheist would actually celebrate their birthdays.
Obviously false since Catholics, Protestants and most other denominations of christian except Jehovah's Witnesses tend to celebrate birthdays. Furthermore Jews, Bahai, Buddhists and Hindus celebrate birthdays so your assertion that only atheists do so is prima facie bullshit. I am atheist though and if you don't like it fuck off. Furthermore, in the unlikely event that you do like it, fuck off anyway. This is for you
, this is for Yahweh
, this is for the donkey that Mary rode on
and this one is for your mother/aunt