The offer the devil made to Eve was not an offer to help her. It was to condemn her as a "lawbreaker" therefore deserving of death. You see, Lucifer himself was a lawbreaker and accused God of being unfair with His laws. In his accusation, he convinced a third of the angels to rebel against God. Lucifer did this out of jealousy because he wanted to be like God. The devil is just a coward who doesn't want to die alone.

Now, God doesn't force anyone to love Him. He gives everyone free-will. The devil serves as an example of what life is like when we are free of Gods laws. Because of the devil, we have wars, death, rape, illnesses, and suffering. That is the product of lawlessness. God's laws offer true freedom. While you are in Gods law, you will not murder, lie, steal, have envy and you will love your neighbor as yourself. Without God's laws, you are subject to "anything goes" mentality. How safe would you feel if you left your house to get groceries, but laws don't exist? You probably wouldn't want to even leave your house! It just would not be safe out there without ANY laws in place. Therefore, laws serve to protect you and ensure your happiness.

What God is offering is life eternal with Him. God is a social being who loves our company, which is why He said that He's prepared a mansion for each of us and He wants to dwell with us for all eternity.