Many of these articles, from a Secular viewpoint, attempt to identify the motifs and concepts found in Christianity which do not appear in the Old Testament. It is understood that Christianity "evolved from" Hellenized Judaism, which itself, had in turn accepted certain Hellenized Greek concepts about the relationship between God and Man (this "Hellenizing" being opposed by the Rabbis). In some cases these Hellenized Greek concepts are traced to ancient Egyptian and Semitic concepts, which the Greeks came to be exposed to in the course of the 7th-1st centuries BCE.
It is my understanding that some of Christ's Non-Hebraic teachings, are derived from Plato, transmitted via Hellenized Judaism of the 4th-1st century BCE. For further research on Plato and Platonism cf. the following urls which discuss the parallels and similarities, which were recognized and acknowledged by the Early Fathers of the Christian Church :
For an interesting presentation on the "textual variants" of the New Testament from the 4th through 12th centuries CE cf. the following articles by an Islamic Apologist refuting Christian Apologist claims on the "accuracy" of the New Testament: