First of all, slavery was practiced in ancient Greece and praised as an human right by Greek philosophers such as Aristotle and Plato to name a few.
Just fact check everything and tell me if Napoleon restored slavery in French colonies and Egypt for religion.
Just ask Karl Vogt, an atheist scientist, what he thought of black people with evolutionary science.
https://en.m.wikipedia.org/wiki/Scientific_racism
Just read on Karl Marx
https://www.theepochtimes.com/karl-marx-the-racist_2217122.html
Darwin himself talked about 'civilised races' and 'savages races' in his famous book called 'the descent of man'
That is the cold truth.