The second step in Satan"s temptation was to deny God"s word. In denying it he imputed motives to God that were not consistent with God"s character. God"s true motive was the welfare of Prayer of Manasseh , but the serpent implied it was God"s welfare at man"s expense. [source][source][source]
This added suggestion seemed consistent with what the serpent had already implied about God"s motives in Genesis 3:1. Having entertained a doubt concerning God"s word, Eve was ready to accept a denial of His word. [source][source][source]
What the serpent said about Eve being as God was a half-truth. Ironically she was already as God having been made in His image ( Genesis 1:26). She did become like God, or divine beings (Heb. "elohim), in that she obtained a greater knowledge of good and evil by eating of the tree. However, she became less like God because she was no longer innocent of sin. Her relationship with God suffered. Though she remained like God she could no longer enjoy unhindered fellowship with God ( Genesis 3:24). The consequent separation from God is the essence of death ( Genesis 2:17). [source][source][source]
The first doctrine Satan denied in Scripture was that sin results in death (separation from God), or, we could say, the doctrine that God will not punish sin. This is still the truth he tries hardest to get people to disbelieve. [source][source][source]