see the adoption of the Gospel by the Empire as part of a prodiential plan for the spread of the Holy Gospel: "in the fullness of time" was operationalized by God as meaning when His chosen people from whom the Christ would spring were incorporated for the first time into a stable multi-ethnic state with a generally used linga franca (Greek).)Yes, this is called the principle approach in the Home School curricla that my children are (and will continue to be) taught.
My point, and it was not answered by you, is that the church had a lot more conformance to the gospel when Christians met in homes and not grandiose basicallae, no matter what the denomination. "The church" in the book of Acts, was not a place, but a community, a manner of living, and people showing G-d's love. That faded away when the church become "of the World" and not "aliens and strangers" in the World.
I think you'll find that the Church never became a place. We Orthodox build very grand edificies in which to hold our Liturgies, but the hut which St. Herman of Alaska made into a temple by blessing it, setting up a few Holy Icons, and laying a cloth blessed by his bishop on a rude wooden table (or for that matter the intermittently existing temple which the Mission I serve sets up and takes down in rented space for each Liturgy) are quite suitable, and when the faithful gather are the Church in that place.