Deifying humans was a common pagan practice, explaining Jesus’ deification

Acts 28:3-5. Paul being bitten by a viper, felt no harm from the effects of the poisonous bite, and was, therefore, held by the barbarians surrounding him, to be a God.

The ease with which a human being was deified in those days, accounts for the astonishing superstitious belief; that Jesus was at the same time mortal and a God.