They say hi like anyone else. There is no special "I'm an atheist - how about you?" phrase that is used to feel out new acquaintances to know that it is "safe" to talk about the topics atheists talk about in private (government overthrow, the abolition of crunchy peanut butter, and such)
There are no rules of behavior that apply to all atheists because it is not an organized religion. Some atheists are very respectful of others and some are not.
An atheist does not believe in God.
this is how, hi!
Even atheists still say 'thank God' because the words are overly used in the society, but to atheists, the words are just words; they do not mean much.
to say hi
hola is how to say hi in cuba
Say Hi was created in 2002.
this is how you say hi in Spanish hola
hi in Filipino: Hi or Kumusta?
You can say "hi" but you can not jump "hi".
Hi
Often they say come variation of "Would you like Kleenex?" or "Allergies?" the Christian custom of pronouncing a blessing on the sneezer to ensure they haven't coughed out their soul is not a tradition with atheists.