I am not so sure that atheists have great angst when they die, they probably just think they die and don't feel any Hellish pain locked inside a casket with only the occasional visit (tormenting?) while alive forever there-eyes wide open -inside that dank, dark place.
Not being glib or facetious am I ?
I don't mean to, I am just saying what I think an atheist thinks of that moment in our lives that we pass from life to death.
While on this subject, I love Corinthians scripture that says , To be out of our earthly body (experiencing death) is to alive be with Christ.