Zacharias, Elizabeth, and John are involved in setting up the first Christmas. Joseph, Mary, and Jesus are involved in setting up the first Christmas. Caesar, Rome, and Roman soldiers and tax collectors are involved in the first Christmas, but no one was more involved in the first Christmas than God the Father was!
Christmas is God’s temporary invasion into human history at exactly the right time and place in order to pay man’s sin-debt through shedding His innocent blood on a Roman cross, being buried in a rich man’s tomb, and rising from the dead—according to Scripture. It’s “Bigger AND Better!” than we understand.