A critical response to @catholic_reversion

 @catholic_reversion very encouraging you are almost correct on the first century, nice.  But let’s correct it:

Yes all first believers were ,”the way,”.  They were also all Jews, what we would call messianic today.  Everyone saved at Pentecost were Jews from all over the Roman Empire (acts 2). They went on to start believing communities or messiah communities where they came from.  They started them in the Jewish communities, this is most likely how the believers in Rome started.  

Even though Paul starts communities like Crete, he mentions that the people of Crete are evil in Titus 1 he also mentions Jewish believers as well.  Titus himself was Greek.  We know all the communities in Asia Minor that Paul writes to were Jewish because biblical archeology has found that first century churches were synagogues.  And yes in Antioch they were first called Christians (little Christ). But we’re still mostly Jews.  This remains the same through the end of the second century.  Durning the Roman persecution which mostly only affected the gentile believers as the Roman’s didn’t also notice the messianics.  The messianic Jews isolated into separate communities while the gentiles went under ground.  The gentile believers once Christianity became the official religion moved out of catacombs into pagan temples, which led to a mixture of the too.  For a short while in the 5th century the gentile believers were persecuting the Jewish communities I suppose out of retaliation for not being included in the Roman persecution.  Origen and other church fathers ref to the Jewish believers.  

Now you actually got the date right for Ignatius letter 110, nice.  And it was he that coined the term katholokos, which is transliterated catholic but which only means universal or spiritual, referring only to the spiritual body of believers the same as Paul in 1 cor.  

Now let’s correct your dates:  first the Besorah:  Matthew written between 70-80, believed to be originally written in Hebrew/Aramaic and drew from the Tanakh, it was written to Jews.  Mark a disciple of first Paul then later Peter, this is Peter’s account of the gospel, written between 39-40.  Luke a disciple of Paul write his between 60-85, he wrote to messianic communities that also had large gentile population.  John wrote his from 90-95.  Early scholars don’t see John’s gospel as being very Jewish but as we learn more about the first century Judaism, to include the Dead Sea scrolls, John is recognized as the most Jewish next to Matthew’s.  Other Jewish writers attributed divinity the Word, (Logos - Greek, Memra - Aramaic).  Some of John resembles a rabbinic commentary, and a wealth if references point to the Jewish traditions and institutions dating from the time of the TANAKH:  Jacob’s ladder, Shabbat, Sukkot, Hanukkah, Pesach all appear. Acts written by Luke is the history of first century Christianity.  Written in 62.  Chapters 1-12 deal with Peter in Jewish and Samaria regions while the rest deals with Paul in gentile areas and ends with the arrest of Paul. 

 The last one that I’ll get to right now is Paul’s letter to the Roman,  was written the winter of 56-57, written at the end of his third missionary journey, possibly from Corinth.  This community was started from Jews that had went to Shavuot of acts 2.