Doherty notes that, with the conquests of Alexander the Great, the Greek culture and language spread throughout the eastern Mediterranean world, influencing the already existing cultures there. The Roman conquest of this area added to the cultural diversity, but also to a sense of alienation and pessimism. A rich diversity of religious and philosophical ideas was available and Judaism was held in high regard by non-Jews for its monotheistic ideas and its high moral standards. Yet monotheism was also offered by Greek philosophy, especially Platonism, with its high God and the intermediary Logos. According to Doherty, "Out of this rich soil of ideas arose Christianity, a product of both Jewish and Greek philosophy", echoing Bruno Bauer, who argued that Christianity was a synthesis of Stoicism, Greek Neoplatonism and Jewish thought.