The Church was established because of the fact that Jesus was God, performed miracles, spoke about the kingdom of heaven, was killed for our sins, and rose from the dead.  Secular?  Where are the stories of his actions up until his ministry where he surely worked, paid taxes, gave to charity, went to Temple and all of those other secular things that we, I suppose, are to emulate?  No one wrote them down; it wasn't the point and arguably the opposite was the point.  He was a King but not of this Earth.