As far as I am concerned existentialism plays no part.
That life exists.
Atheists have friends like anyone else; existentialism is irrelevant.
It does no such thing ! You may want to read about philosophy to learn what existentialism is.
Atheists believe friends exist.
Families of atheists exist.
We are pretty sure it exists.
Jean-Paul Sartre is known as the father of atheistic existentialism. He was a French philosopher, playwright, and novelist who explored themes of freedom, responsibility, and the absence of a higher power in his works.
I am not sure what is meant by Life Domain Family. It may not necessarily have to do with atheism. and nothing with existentialism.
Humans have values, secularly as well as religious. Religion need not play a part in human values. Existentialism is moot.
Suffering and dying exist. Existentialism has no part in atheism.
Sexuality exists, just like new, fun big words!
Atheists will agree that humans exist and my opinion that human purpose is to live, learn, teach, enjoy life as we only get one shot, and to try to leave the world better off than when we came into it.