How did Christianity first spread and become popular all over the Roman world?

i read that it spread very very slowly, since whenever the Jewish revolt was in 67? a.d. and then the diaspora spread jews out around the Mediterranean and into provinces of the Roman Empire and THEY? spread the new belief in Jesus? why they would do that and how? & did Christianity really not spread until the... show more i read that it spread very very slowly, since whenever the Jewish revolt was in 67? a.d. and then the diaspora spread jews out around the Mediterranean and into provinces of the Roman Empire and THEY? spread the new belief in Jesus? why they would do that and how?

& did Christianity really not spread until the printing press came out? or how it spread before?
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