In the Gospel of Mark chapter 5, it says"
And when He had come out of the boat, immediately there met Him out of the tombs a man with an unclean spirit, 3 who had his dwelling among the tombs; and no one could bind him, not even with chains, 4 because he had often been bound with shackles and chains. And the chains had been pulled apart by him, and the shackles broken in pieces; neither could anyone tame him. 5 And always, night and day, he was in the mountains and in the tombs, crying out and cutting himself with stones.
6 When he saw Jesus from afar, he ran and worshiped Him. 7 And he cried out with a loud voice and said, “What have I to do with You, Jesus, Son of the Most High God? I implore You by God that You do not torment me.”
8 For He said to him, “Come out of the man, unclean spirit!” 9 Then He asked him, “What is your name?”
And he answered, saying, “My name is Legion; for we are many.” 10 Also he begged Him earnestly that He would not send them out of the country.
In this passage, Christ forgives,heals and frees the man from the demons.It also says,that no man could tame the demon-possessed man, which clearly shows that the man was not in control of his body and mind.
Going back to Genesis, the snake that tempted Eve did not do so out of its own, but due to Satanic control .Both the man that Jesus healed and the snake were the tools of Satan.
Why did God curse the snake (the created animal) for something that Satan did? Thanks