I understand evil exists within each of us, as we are all born into sin and have the capacity to do evil. However for the magnitude of evil that currently is taking over the world, and has been running the world since the beginning of time, it's not flesh & blood we war against, but to quote Ephesians 6:12: "our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms".