Frankly - this is a bad book.
1) Rius gives a very sloppy history of Western philosophy from about p. 36 to 76 - emphasis on the word "sloppy".
2) Bad history. The author frames most of human history as science v religion quarrel, which is bizarre because this is idealist and and ahistorical nonsense.
The bad philosophy and anti-religious bad history combine to create a rather shoddy narrative.
"Philosophy doesn't quite end here . . . even if it did almost vanish with the appearance of the false, backward Christianity of the Middle Ages . . . Not by accident, this unbelievable epoch is named "The Age of Faith" (and by "Faith" understand the denial of ALL scientific reasoning)." (p. 53).
Which aside from dismissing about 16 centuries of European culture doesn't even make sense on a philosophical level. "Scientific Reasoning" as a process based on empirical observation, data collection, and peer review only has its origins in the 18th century societies of gentlemen-scholars in northern Europe.
Also, just to go back to the supposed denying of science - um, Albert the Great? Peter Peregrinus? Leonardo Fibonacci? Roger Bacon? William of Ockham? Nicole Oresme? Nicholas of Cusa? Hell, ***Pope*** Sylvester II?
Or here is an ancient example:
"At Agrigentum, Empedocles . . . also thought that everything was made of fire, air, earth, and water - a theory that survived right into the Middle Ages and which prepared the way for modern chemistry" (p. 44).
Which, no it didn't. The "four elements" has no physical basis in reality and was a folk belief masquerading as a philosophical conjecture. Modern chemistry wasn't bourn out of Greek philosophy, if anything it was born out of alchemists, herbalists, and miners.
More importantly - you can't have it both ways, Rius. You can't complain about "the medieval Church" (And which one? Between the schisms, heresies, popes and anti-popes, there was never one "medieval church") suppressing scientific reasoning, and also hold up non-empirical, non-materialist ancients as models of "science".
"The Egyptian argument was quite simple: men were created by Osiris and must obey his will on this earth. They must put up with slavery in the hope that, if they behave well, a better AFTER-life awaits them in the next world - no more slavery, only eternal bliss. However, the world wasn't totally deprived of men (no matter how few) able to resist blind faith, who prefer to come to their own conclusions, relying on science . . . " (p. 41 - 42).
Wow. This isn't even Marxist, this is just elitist nonsense. Ordinary people are not mindless lemmings, but rather are usually able to correctly identify their interests within their own social and material constraints. The peasant masses of ancient Egypt were not just brainwashed rubes toiling away because "Osiris" told them too, that is simply a stupid view of history.
It's also a stupid view of Egypt - notice I said "peasants". Most Egyptian laborers were peasants, and in fact Egyptian slaves *did* stage revolts. In fact, Egyptian peasants *also* staged revolts to overthrow their oppressors - there is a reason why Egypt has dozens of dynasties and multiple intermediate periods and breakaway states, and it isn't because everybody is merrily content with the way things are.
Which leads into my second Marxist critique of this supposed introduction to Marx - the focus on Great Man history. "However, the world wasn't totally deprived of men (no matter how few) able to resist blind faith . . . ". No! It is class conflict that is the engine of history, not the philosopher-aristocrats of the ancient world.
Moving on:
"Democritus instead was persecuted for holding materialst ideas . . . Democritus was talking about ATOMS four centuries before Christ and twenty four centuries before Einstein" (p. 49 - 50).
Sigh. No, those weren't materialist ideas - that was an intellectual thought experiment about how small an object could get. The modern atoms were named "atoms" as a historical Easter Egg, not because they have anything to do with Democritus.
My favorite is the description of Fedualism:
"Feudalism comes form the Latin word, Feudum, the name given to lands which the king divided up among his nobles in exchange for their support. (A feudum = a fee). Those who actually lived on the land had some claim to their bit of earth. But their labour belonged to the feudal over-lord to whom they paid taxes and who used them whenever he went to war. When I say "king", by the way, you can just as well read "Pope", because the Church of Christ was also a feudal system like any other (and probably worse)" (p. 128 - 129).
And that's it!
1) No analysis of land as the basis for economic production.
2) "Pay taxes" - two words and that's it. Not even the slightest explanation of land-lords collecting rents from dependents (something Marx railed about), nothing about rendering service as tribute on the lord's demesne (something Marx railed about), nothing about the use of violence and coercion to force compliance, no view of conflict or history.
3) Another potshot at an all-powerful, centralized medieval church. Feel free to criticize the medieval Church for all the bad things that it actually did, but the Pope isn't handing out land to feudatories. It's the opposite - prince-bishops and territorial abbots received fiefdoms from secular lords. But somehow this is "probably worse" than the actual warlord dynasties running rampant over medieval Europe?
I could go on, but the basic problem is that Rius is so determined to create a narrative of "The Christian Dark Ages wrecked glorious enlightened Greco-Roman philosophy" that he not only gets science, religion, philosophy, and history wrong, but he completely throws out any sense of a Marxist analysis of history so that he can take potshots at a transhistorical religious boogeyman.