Are you capable of elaborating?
Because... atheists aren't interested in immortality?
I will accept that some are. Some are are content living this life the best they can and then pass the torch to the new life.
The secondary reason I became atheist is because it requires zero
effort on my part. Its not a belief system, so it requires no thought or energy. It requires no faith in things that may or may not exist. Atheism is a world-view which is supported with Critical Thinking. Any faith-based religion does not meet the criteria of Critical Thinking.
Xeroism, at some level, requires a certain degree of faith in stuff that doesn't (yet) exist. That's why it is unappealing to me.