It's even weirder than that, there's many ideas that might very easily be described as "pagan" except that they're entirely accepted as orthodox. For instance the entire notion of the Trinity is at its root a straightforward application of Neoplatonic philosophy, where the "One" Godhead exists as three lower "hypostases" (Greek) or "persons" (Latin). And much Stoic ethics was adopted directly within early Christianity.

To be entirely fair about it, the linkage may easily go back to the very time of Jesus in some important ways, seeing as many of Jesus's teachings were shared with the Essenes', and the Essenes in turn were quite knowledgeable about Greek/Hellenistic philosophy.