The National Geographic web-site publishes this story:
These 12 Men Shaped Christianity—But Were They Real?
Link: : https://news.nationalgeographic.com/2016/03/160306-bible-apostle-jesus-christian-religion-ngbooktalk/?cmpid=org=ngp::mc=social::src=facebook::cmp=editorial::add=fb20181222culture-resurfapostlesbooktalk::rid=&sf204668865=1
In secular history, Jesus is a shadowy figure, but, as the above discussion shows, so are his 12 selected 'leader's' of the early church.