Whatever your personal views, the vast majority of people on this planet believe either in an afterlife, or some form of continuing spirit. To say such an ending is sick makes the assumption that - as a
fact - there can be no afterlife. Never mind the barking mad American Intelligent Design idiots, proper scientists are about a billion miles from making this conclusion. We just don't know. [BTW, if you want to read more on this, try an excellent anthology called
Quantum Questions which is the collected writings of the 20th century's greatest theoretical physicists, including Einstein, on this subject.]
Given that we don't know, what on Earth is wrong with fiction exploring this possibility? Personally, fundamentalist Athiesm I find as offensive as fundamentalist Christianity, Islam or anything else...