There are no categorically atheistic views on any topic except a general lack of belief in gods. Apart from that atheists are simply people. They do not all think alike and with one mind such as theists. You have confused atheists with theists who generally hold religious beliefs as a group.
We believe sexuality exists.
Atheism is NOT A RELIGION. It has no rules. Those are given by morality. Every atheist has different opinions.
That is not a question. Atheists view friends as friends.
Suffering and dying exist. Existentialism has no part in atheism.
What you have described is simply a family that does not believe in gods.
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.
Any atheist is a person who simply doesn't hold a belief in a god or gods. As such, he or she could have any belief about suffering or death, because atheism is not a belief, and it is not dogmatic.
There is no atheistic belief in life after death.
Atheism has no doctrine or dogma to refer to because it isn't a religion or set of beliefs. Atheism is merely the label applied to those who choose the "off" position to Theism (the belief in a "god[s]"). It is not, however, the statement "There is no 'god[s]'."
To my knowledge atheism is not philosophocal, therefore existentialism, which means existence, is moot. We do believe that humans, religious or non, have problems. I don't really assume they exist, but research through independant studies conclude humans have problems, minor and major.
Several of the former communist states were officially atheistic.
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.