The Luthor's are Nietzschean Atheist's, where Clark Kent was raised a Methodist. Nietzsche's father was Lutheran Pastor, it is not a surprise given the extent of Nietzsche's influence in the Superman/Clark Kent story that the Luthor's (the main antagonists in throughout the story) would have recieved their name from Nietzsche's father's societial position. Lex had a copy of Nietzsche's Beyond Good and Evil on his bookshelf.
The very concept of 'Superman' comes directly from Nietzche's Übermensch (which translates from German into 'Superman' and 'Overman'), a strong man of the future who is self-produced through the nurtuing of certain qualities within himself such as self-mastery, courage, "hardness" and the virtue of meekness. He wrote about the 'Superman' in his series of books titled Thus Spoke Zarathustra: A Book for All and None. Nietszche declared that God is dead and could no longer lead His people, so he sent them the 'Superman'. This man is the epitome of striving to be something more. The 'Superman' must make his 'will to power' by controlling his senses and making his own rules of goodness and truth that are beyond that of what the bible suggests. In the Pilot episode Clark drops his books when approaching Lana, as she helps him pick them up she hands him a copy of The Portable Nietzsche. She says that Nietzsche seems a little dark for Clark, but he respondes that 'we all have a darkside'. She then asks him if he is 'man or Superman' and he replies that he hasn't figured it out yet. This is of course fitting since the Smallville series is about Clark trying to figure out and attain his destiny as Superman.
Clark Luthor's character draws on another idea from the same book Thus Spoke Zarathustra: A Book for All and None. Clark Luthor is an embodiment of the opposite of the 'Superman', in the book he is referred to as 'The Last Man' or 'The Ultimate Man'; the latter name being very similiar to the alter-ego Clark Luthor gave himself as 'Ultraman'. This man is completely happy as he is, and does not strive to be anything better than his nature.
Faora says to her son Davis Bloome after she impales him "That which kills you makes you stronger." This is a corruption of the quote by the 19th century German Philosopher Friedrich Nietzsche "That which does not kill us makes us stronger". But it is true he becomes stronger based on any attack against him.This category currently contains no pages or media.