
Arthur M. answered 12/16/20
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The more correct of the two answers provided is the first, "inspired humans converted their family and friends". This is simply because as more people convert to a religion they are likely to proselytize other individuals, resulting in exponential growth.
It works like this, Jesus preaches during his lifetime, gaining disciples. After his death, those disciples continue to spread the message of Jesus to other individuals and communities, who in turn do the same, converting their friends and family. The process is then repeated again and again, each time gaining a wider sphere of influence.