So what else is there to name it apart from "God," since it is everything. Even if it is given numberless names, they are spoken simply as a reference to it, since it transcends every word, every voice, every intellect, every thing, and (even) every silence.
Tripartite Tractate 129.15-25 (Valentinian late second century text)
Mosaic: third century, Vatican grottoe under St. Peter's Basilica, tomb of the Julii, depicting Christ (?) as the sun-god Helios or Sol Invictus riding in his chariot.