There is entire book proving that marxism is religion wrote by polish soldier,monk and sovietolog Józef Bocheński,and atheists just belive that God do not exist,just like we christian belive that He exist.
Death is not worst that could happen to anybody.
Back to topic - Buddha,Chineese masters,Marx tried to made atheism working.All we get - new religions.It is established fact now,that religion could not be erased,only changed.