It is called free will, kind of like the whole junior thingy.
You decide who you will serve, Christ or satan, it called freewill. You have it, I have it, every man woman and child born has it.
And it repented the LORD that he had made man on the earth, and it grieved him at his heart. And the LORD said, I will destroy man whom I have created from the face of the earth; both man, and beast, and the creeping thing, and the fowls of the air; for it repenteth me that I have made them. [Gen 6:6-7]