Jesus tells them to show him the coin for the poll tax, the denarius, and asks, "Whose image is this, and whose title?"
They answer, "The emperor's."
One side of the coin has the image of the emperor and reads, "Tiberius Caesar, son of the Divine Augustus" while the other side reads, "High or Chief Priest." That coin, my friends, was an affront to Israelites. It violated at least two of the Ten Commandments. (Let us not forget that the titles "Son of God" and "High Priest" were only ascribed to Jesus many years, actually decades, later. They were originally ascribed to the emperor. )
Then Jesus says, "Give back therefore to the emperor the things that are the emperor's, and to God the things that are God's."
Render unto Caesar what he owns. What bears his image. His property.
But never, ever, render unto Caesar what he does not own: people. People are not property. People are not commodities.
But most importantly, do you know why God despises graven images and false titles, like what that coin symbolized?
Because God has already created God's image.
God already has a title for them: God's sons and daughters.
People. Everyone! Especially those we think are not children of God.