Describe Christian doctrines, according to Eusebius from the book, The History of the Church from Christ to Constantine?

Christ's doctrine contains nothing novel or strange and neither does his religion. His initial followers were unusually blessed, as the Scripture taught they would be. And only as of late, in Eusebius's time, have Christians become widely known. Nonetheless, the core Christian doctrines lie implicit in the Old Testament, which is neither new nor odd.