Ramsay MacMullen discusses the Christianizing of the Roman Empire and looks at what was taught in face to face encounters between Christians and pagans. He says:
…monotheism, to begin with. That was taught, and God was compared, in familiar fashion, to a monarch with his companies of servants about him; and contrast was drawn between Him and mere imitations, the daimones that passed for gods by animating idols and so forth. Word was spread of divine wrath and punishments, the more readily imagined through being leveled at evildoers resurrected in the flesh; while immortal delights were also known to await the blessed. The very stark blacks and whites of this whole crude picture of Christianity, and the very unsteady focus on the role of Jesus, are most striking.
In a footnote to this paragraph, MacMullen says:
…on Jesus in the theology being presented, [see] the curious paragraph in Athenag., Leg. 10, with really no explanation of Jesus’ role; his entire absence in Minucius Felix (striking at 29.6) and in Theophilus, Ad Autol. (striking at 1.12, 2.9, and 2.22); and his total unimportance for the one recent convert whose theology we can actually form some idea of, namely, Constantine. See Kraft (1955) 60 and passim and Frend (1952) 153.
The passage MacMullen refers to in Athenagoras is here and it is terrible as regards mentioning Jesus – the central figure of the universe and the Church. The Minucius Felix passage is here and is also a disaster when it comes to Jesus the Messiah. I haven’t read the works in question, so I’m taking MacMullen’s word for it, but it is painful to see these presentations of Christianity as a philosophy that really didn’t need to focus much on Jesus.