Scripture says that we are born sinners and that we are by nature sinners
Psalm 51:5 states
that we all come into the world as sinners: “Behold, I was brought forth in iniquity, and in sin my mother conceived me.”
Genesis 3:9
9 And the LORD God called unto Adam, and said unto him, Where [art] thou?
10 And he said, I heard thy voice in the garden, and I was afraid, because I [was] naked; and I hid myself.
11 And he said, Who told thee that thou [wast] naked? Hast thou eaten of the tree, whereof I commanded thee that thou shouldest not eat?
12 And the man said, The woman whom thou gavest [to be] with me, she gave me of the tree, and I did eat.
13 And the LORD God said unto the woman, What [is] this [that] thou hast done? And the woman said, The serpent beguiled me, and I did eat.
Man was created as a perfect sinless entity of God. He was created as a perfect spiritual, physical, intellectual, and moral being. He had no taint or tendency to sin but was righteous with a love for holiness and inclined to follow God or chose rightly.
He was not created equal to God in the sense that God is all-knowing, all powerful and unchanging, but he was created in the image of God. He was a rational or reasoning being with the ability to understand and the responsibility to mature in god-likeness through a daily relationship with God. God wanted this relationship to be founded in mutual love. God formed man so that He was inclined to love God but was not forced to love God. Man was inclined to listen and obey God, but was not forced to listen and obey God. God expected and still expects man to obey Him out of love for Him.
The love of God for man and God’s intimate relationship with man made man a target of another of God’s creations. The Bible gives us no explanation for the existence of Satan and evil before the fall of man, though it does tell us that Satan’s sin was pride. The anointed Cherub thought he understood better, could do better, and lead better than God Almighty. Therefore God cast Lucifer down. When? I’m unsure. Some theologians maintain that it was after the creation of man, though it is generally agreed that the fall of the angels preceded the creation of man.
Satan suggest that God is holding back something very important and very good from her. “For God knows that in the day you eat from it your eyes will be opened, and you will be like God, knowing good and evil.”
Satan substitutes his own lie again. "You will be like God” meaning you can decide what is right and wrong for your own self just like God is doing for you now. “God has given us the power to decide for ourselves has always been the rallying cry of those who reject the biblical revelation.
When Satan wants to gain control over us as he did Eve he often entices us to doubt God’s integrity. He told Eve, in the day you eat from it [forbidden fruit] your eyes will be opened, and you will be like God, knowing good and evil. Satan sets the direction he wanted Eve to go and whispers secret fantasies and powers.