"Education, sir, is the development of that which _is_. Since the dawn of history the negro has owned the continent of Africa--rich beyond the dream of poet's fancy, crunching acres of diamonds beneath his bare black feet. Yet he never picked one up from the dust until a white man showed to him its glittering light. His land swarmed with powerful and docile animals, yet he never dreamed a harness, cart, or sled. A hunter by necessity, he never made an axe, spear, or arrowhead worth preserving beyond the moment of its use. He lived as an ox, content to graze for an hour. In a land of stone and timber he never sawed a foot of lumber, carved a block, or built a house save of broken sticks and mud. With league on league of ocean strand and miles of inland seas, for four thousand years he watched their surface ripple under the wind, heard the thunder of the surf on his beach, the howl of the storm over his head, gazed on the dim blue horizon calling him to worlds that lie beyond, and yet he never dreamed a sail! He lived as his fathers lived--stole his food, worked his wife, sold his children, ate his brother, content to drink, sing, dance, and sport as the ape!<quoted text>I would advise you to study something/someone before making a claim from a title.
Darwin did state the very obvious fact that races differ from each other physically. He also believed that they differed mentally, as in this quote from Descent of Man:
"Their mental characteristics are likewise very distinct; chiefly as it would appear in their emotional, but partly in their intellectual faculties."
"It may be doubted whether any character can be named which is distinctive of a race and is constant."
"The American aborigines, Negroes and Europeans are as different from each other in mind as any three races that can be named; yet I was incessantly struck, whilst living with the Feugians on board the "Beagle," with the many little traits of character, shewing how similar their minds were to ours; and so it was with a full-blooded negro with whom I happened once to be intimate."
"I was told before leaving England that after living in slave countries all my opinions would be altered; the only alteration I am aware of is forming a much higher estimate of the negro character. It is impossible to see a negro and not feel kindly towards him."
Considering the time and societal norms when Darwin lived, he definitely shouldn't be considered a racist.
You see the thing with science is as the body of knowledge grows, theories can change, unlike religious dogma.
some of Darwin's writings on the subject:
"And this creature, half child, half animal, the sport of impulse, whim, and conceit,'pleased with a rattle, tickled with a straw,' a being who, left to his will, roams at night and sleeps in the day, whose speech knows no word of love, whose passions, once aroused, are as the fury of the tiger--they have set this thing to rule over the Southern people----"