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A general assumption that early Christianity was generally aniconic, opposed to religious imagery in both theory and practice until about 200, has been challenged by Paul Corby Finney's analysis of early Christian writing and material remains (1994). This distinguishes three different sources of attitudes affecting early Christians on the issue: "first that humans could have a direct vision of God; second that they could not; and, third, that although humans could see God they were best advised not to look, and were strictly forbidden to represent what they had seen". These derived respectively from Greek and Near Eastern pagan religions, from Ancient Greek philosophy, and from the Jewish tradition and the Old Testament. Of the three, Finney concludes that "overall, Israel's aversion to sacred images influenced early Christianity considerably less than the Greek philosophical tradition of invisible deity apophatically defined", so placing less emphasis on the Jewish background of most of the first Christians than most traditional accounts. Finney suggests that "the reasons for the non-appearance of Christian art before 200 have nothing to do with principled aversion to art, with other-worldliness, or with anti-materialism. The truth is simple and mundane: Christians lacked land and capital. Art requires both. As soon as they began to acquire land and capital, Christians began to experiment with their own distinctive forms of art".
Santa Sabina, Rome, interior (5th century).
In the 4th century, the rapidly growing Christian population, now supported by the state, needed to build larger and grander public buildings for worship than the mostly discreet meeting places they had been using, which were typically in or among domestic buildings. Pagan temples remained in use for their original purposes for some time and, at least in Rome, even when deserted were shunned by Christians until the 6th or 7th centuries, when some were converted to churches. Elsewhere this happened sooner. Architectural formulas for temples were unsuitable, not simply for their pagan associations, but because pagan cult and sacrifices occurred outdoors under the open sky in the sight of the gods, with the temple, housing the cult figures and the treasury, as a windowless backdrop.
lnterior view of Santa Costanza, Rome
The usable model at hand, when Emperor Constantine I wanted to memorialize his imperial piety, was the familiar conventional architecture of the basilica. There were several variations of the basic plan of the secular basilica, always some kind of rectangular hall, but the one usually followed for churches had a center nave with one aisle at each side, and an apse at one end opposite to the main door at the other. In, and often also in front of, the apse was a raised platform, where the altar was placed and the clergy officiated. In secular buildings this plan was more typically used for the smaller audience halls of the emperors, governors, and the very rich than for the great public basilicas functioning as law courts and other public purposes.
This was the normal pattern used for Roman churches, and generally in the Western Empire, but the Eastern Empire, and Roman Africa, were more adventurous, and their models were sometimes copied in the West, for example in Milan. All variations allowed natural light from windows high in the walls, a departure from the windowless sanctuaries of the temples of most previous religions, and this has remained a consistent feature of Christian church architecture. Formulas giving churches with a large central area were to become preferred in Byzantine architecture, which developed styles of basilica with a dome early on. Within the dome architecture Christian churches used them to venerate icons at a larger than life scale, while Christians remained covered and inside.