Can you make a reasoned argument as to what is Man? No.
2bme
J'C: "It is obvious you are speaking for yourself in answering this question. I have no problem with a reasoned argument as to what is a human. First of all your use of 'Man' is the major part of your problem. People come in two sexes, and as KW would point out also two genders. Any reasoned argument about humans must take those facts into account. A human is a social, sexual, reasoning animal. The primary evolutionary advantage of humans was their abstract and symbolic reasoning capability which allowed them to pass up predation and gathering for herding and farming. This lead to large social groupings that needed complex interaction rules that is morality to allow the groups to function and accomplish all of the chores necessary for the society to grow and prosper. Many of the chores consisted of preserving the lore and knowledge of not only the tools and techniques, but the socializing and educating of the tribe. Another function was the integrity of the society, both in protecting it from intrusions and from internal sedition. All of this taxed the abstract and symbolic reasoning capability of the people to the utmost and some found ways to delegate the most difficult of these chores to tribal leaders, shamans, and ultimately to God.
Gender roles were dictated by biology for much of human history, women were in charge of the education and nurturing of the children and social cohesion. They were tied to the hearth by biology and their substantial economic contribution was home based. Clothing and tool manufacturing especially. The social cohesion provided by the casual conversation at the water source, the marketplace and the church.
Men were less tied to the hearth and frankly less valuable to the community so were assigned the dangerous chores of herding and predator control including the smartest and most dangerous predator, other humans. If things were going well men had time to think about more abstract things like why things were as they were, and how to understand their world so that they could make it better. Some were unable to participate in this intellectual activity and 'built the Cathedral' by sweeping the floor. Or protected the village by fighting on the periphery.
All changed radically when medicine and hygiene made fecundity of women perhaps an undesirable feature, and women were able to limit family size and have a decent chance of one child equaling one productive adult. The world is still shaking this major evolutionary change out."
The usefulness of God and religion was in keeping the floor sweepers and cannon fodder focused on the glorious afterlife. Valhalla, Asgard , Heaven, all with pie in the sky after you die, particularly if you died in the service of God. Please note that this is of need only for males who are taught from infancy to serve God and the shaman in any way they could, and if they could do nothing else do what the shaman says and God will take care of them in the afterlife. They were given strict rules to keep them under the shaman's control, and internalized their worthlessness relative to the shaman and God. This works very well for those that are unable to deal with the human male condition of subservience and worthlessness. The streets of heaven are paved with gold, and the whole universe is a playpen. God only knows how they would learn to play in that playpen, but they never think about that. And as for all the beautiful virgins without the necessary physical equipment you can't even jerk off.
We will see how it all shakes out. The God guys are out-breeding their resources, with significant help from the Pope, although the Pope is also insuring that AIDS will help with the population problem. Those controlling their breeding also control most of the resources. It will be interesting to see what they do with them. The main resource being intellectual of course, China, parts of India, Europe, and parts of the US are using those intellectual resources very effectively. How they will "share" will probably be ugly.