Satan is only the god of this age. In other words, when this age is over, satan won t be the god anymore. When Jesus comes to start a new age, satan will be gone. The other Greek word for world is kosmos meaning world s system or organization. The English word cosmetics comes from kosmos .
Cosmetics simply means to organize the face.
The world is under an organized system right now. Here satan is called the prince of this kosmos. He is not only the god of this aion of age, but also the prince of the kosmos , this world s system or organization. This world is operating under a system. Birth entitles you to operate under this system.