Spliting from Judaism and spreading to the Greco-Roman world, Christianity was spiritually enriched by Greek philosophy and grew gradually into a new religion with Greek and Roman cultural features. Apparently, there was a spiritual pursuit shared by both Greek metaphysics and Christian spiritualism theology. The tendency of spiritualism that emphasized "what lied behind" became more and more prominent from Pythagoreans to Platonists, and by Philo's method of allegorical interpretation, such a Greek metaphysical tradition exerted a profound impact on Christian gospels and the early Christian theology, and caused the emergence of a fundamental dualism between matter and spirit.