The culture of death is a culture where death, both metaphorical and literal, is glorified and brought into effect everywhere, while the vital desires are suppressed or channeled for evil ends.
In a culture of death, religion would be centered around the concept of death as salvation, since sacrificing through death would be the only concept worth glorifying. Through death, everything is made anew. Death would be seen as something desirable, because it leads one to a world which is far better than this one, and for which a miserable life would be worth living (of course suicide would be discouraged, since that goes counter to the propagation of religion).
In a culture of death, war would be virtuous, as a deadly sacrifice. The exercise of mass death would be considered almost holy in itself. War rhetoric would portray the soldier as protector, in the same way that religious sacrifice through death protects the believer.
In a culture of death, entertainment would thoroughly desensitize people to the concept of humans being killed, programming them to not be repulsed by death sacrifice. In contrast, in such a culture, seeing the murder of a pet would lead to great outrage, but seeing dozens of people murdered would not be a problem at all.
In a culture of death, because of this constant desensitization process and dehumanization process, people would routinely call for brute violence to be done to their fellow citizens, even outright killing them, and this would be considered normal.
In a culture of death, everything that is good in children would have to be stomped out of them through incompetent parental child-raising and a schooling system that is little more than an indoctrination system. Otherwise they might grow up to be healthy adults who are repulsed by violence and sacrifice, which would be a disaster. Their minds would have to be deadened.
In a culture of death, children would have to learn that there is no such thing as right and wrong apart from orders from proper authorities, because ultimately they would have to learn that death, when properly ordered, is just.
In a culture of death, people would be motivated to have children instead of taking care of lives already existing. Since suffering and death would be ultimately positive, there would be little reason to try to relieve it. Having more children would be positive because it would provide more possible sacrifices.
In a culture of death, constant sub-divisions of society would be created so they could fight against each other and thus rely on some higher authority to bring their ideals to victory. The existence of this higher authority, which orders killings, would thereby be justified.
In a culture of death, people would be profoundly uneasy with suicide, since this would represent independently taking one’s life into one’s hands. Death would be a matter to be left in the hands of proper authorities.
In a culture of death, vital functions such as eating, sex, the desire for recognition, would all be reduced to the desire to control each other, dividing society further.
In short, a culture of death devalues human life and devalues the natural traits of healthy minds.
In a culture of life, religion would be centered around the joys of life. War would be considered a vice, and soldiers would be seen as killers. Entertainment would not peddle death as amusement. People would not call for violence or death to be inflicted on each other. The innate qualities of children would be preserved and cherished. Children would learn there is right and wrong, and that they are part of themselves. People would not be motivated to have children. People would rely on each other and deal with disagreements instead of appealing to higher authorities to suppress disagreeing parties. People would not be uneasy about suicide, and would simply accept it as freedom over one’s life. Vital functions would not lead people to try to control each other. Human life would be valued and the natural traits of healthy minds would be valued.
Cultures of death create societies based on control. Cultures of life create societies based on love. The choice between life and death is an ever-present choice. We make that choice with everything we do, think and say.