This might be unrelated. But why do Atheist have funerals anyway?
Sometimes I think they are a creation of intrests hostile to Christianity to perpetuate negative propaganda. You might be right! That is about the only thing that makes sense regarding these people.
The Jewish and traditional Christian treatment of death and mourning is brought up in secular grief courses (well, at least the ones I took at University) not for their religious content and message, but for their efficacy in helping the family and friends grieve and mourn in a way that allows for closure and minimal psychological effects (i.e. depression, etc.). Funerals are part of said treatment - while there is a lot of pain in the moment, the funeral (and more so an open casket funeral) is a key component to accepting a person's death, and is a great opportunity for the community to support those who suffer most (spouses, children, close family, etc.).