Sexuality exists, just like new, fun big words!
This does not really have to do with extentialism, But we atheists view sexuality as a healthy part of an adult's life.
There is no impact. If people don't like people of a different sexuality, it's because that's just how they think, not because they're atheist. There isn't an atheist book about what you should think about heteros/homos/trannys etc.
We are pretty sure it exists.
That life exists.
It does no such thing ! You may want to read about philosophy to learn what existentialism is.
Atheists have friends like anyone else; existentialism is irrelevant.
Families of atheists exist.
Atheists believe friends exist.
As far as I am concerned existentialism plays no part.
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.
Humans have values, secularly as well as religious. Religion need not play a part in human values. Existentialism is moot.
I am not sure what is meant by Life Domain Family. It may not necessarily have to do with atheism. and nothing with existentialism.