there's a lot to it. there's little to no doubt about that. for instance, most kings & monarchs of the world claim they're descended from gods (or are appointed by God in a few cases).
even it's been said that the royal family of england is descended from god. my folks got banished from scotland due to the king of england. so, if he's a direct descendent of god, where does that leave us descendents of protestants that he kilt?
I don't believe any monarch of Christian lineage has ever claimed to be a descendant of God, but have believed themselves ordained to rule by God, and there is scripture for that. Certainly, most kings took it further than intended, which gave rise to the divine right of kings doctrine. Christians are in lineage with God, but by the adoption of salvation, being heirs and joint heirs with Christ. Obviously, none of us live up to that gift but is something to strive for and perhaps the reason.