Jewish scholars tell us that as many as 20% of first century Israel may have accepted Jesus as the Messiah. We know that three thousand came to the Lord on the Feast of Pentecost (Acts 2:4) and shortly afterwards another 5,000 men plus any women and children became believers (Acts 4:4). Acts 6:7 then records that a large number of priests became obedient to Christ. Many years later when Paul came back from his third missionary journey, probably around 60 AD, we read that the number of true Christians had already grown to tens of thousands - see Acts 21:20. The Greek word used in this verse is murias, which according to The New Thayer's Greek-English Lexicon of the New Testament , literally means; "a ten-thousand; a myriad or indefinite number; an innumerable multitude; an unlimited number" (p.419). See Luke 12:1, Acts 19:19 and Jude 14 for examples of the use of this word. If there were already so many believers in 60 AD, there would be no places left between the 1870
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