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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.

You call it legalism when folks continue to honor God's appointed times [Leviticus 23:44] and Sabbaths....but when folks observe holidays and religious festivals invented by mankind.....that's simply O.K.? ......I got it!

Yeah.....who does He think He is, anyway? Asking us to observe all these legalistic Old Testament Feast Days and Sabbaths. After all.....He did tell us to not do it anymore, didn't He? Oh.....here it is....[I Papacy 1:11]. Read it aloud! "Do not honor God anymore by observing His Holy Days and Sabbaths. Instead honor the Church of Rome and all our Pomp and Tradition."

I knew I could find it.

Regarding your cite of Pliny. First off, Pliny was Second Century, which when paired with Justin Martyr's anti-Semitic screed "Dialog with Trypho the Jew" proves only that Gentiles were becoming quite anti-Semtic in some congregations. Secondly, since you claim you are citing Pliny, have you actually read the text yourself? There is no mention of the "first day." He says, "...a certain day ". Even if you do not have access to the Latin text, you can read what Tertullian wrote about Pliny's comment (circa 200 CE):

He found in their religious services nothing but meetings at early morning... Tertullian's Apology section 2. No mention of a day of the week.