[safisoft]

but a credible non-Christian source detailed the early Christian practice of gathering in the morning on the first day of the week sinning and prating together and then after work gathering and having the Lord's Supper, which was a part of the Agape Feast. If worshiping on Saturday versus Sunday was so critical why did the earliest Christian churches do this?

First, you must provide a reference to your "non-Christian sources" and next, you must define what "earliest Christian churches" means. If you mean those in the Second Century, you have no argument. If you mean those in the First Century, you have no such proof. Only Scripture stands in in that regard, there is no such extant text. If, on the other hand you want to show how the Gentile "churches" began to deviate from the Apostles' teachings, as Papias tells us that they did (100 CE), then by all means, cite away.

The most complete scholarly piece written to-date, using the Vatican's own library, was done by Samuele Bacchiocchi. His work sheds complete (non-sectarian) light on the matter. The title is From Sabbath to Sunday : A Historical Investigation of the Rise of Sunday Observance in Early Christianity

[wmfights]

First, you must provide a reference to your "non-Christian sources" and next, you must define what "earliest Christian churches" means.

See Pliny letters.

Pliny is hardly a supporter of Christianity, being a Roman legate and having killed numerous Christians when interrogating them. He would have no reason to lie as to Christian religious practices.

I'm surprised you would want a definition of earliest Christian churches. I mean those assemblies of Christians who gathered together to worship and celebrate The Gospel.

Maybe it's time for you to explain why the legalism of having services on Saturday is so critical when there is secular evidence that our brothers and sisters in Christ during Apostolic Era and the centuries immediately following did not do that.