He certainly did finish it he overcame Satan and won him on his own ground,
You, like the ancient Jews of Jesus' day are giving power to Satan and denigrating Jesus the Christ and His finished work on the Cross of Calvary saying that because of Satan Jesus died. That is blasphemy.
The sad part is that you have been indoctrinated to not see it.
and now he's helping me to overcome him too
Not if you think that Jesus was subservient to Satan's desire. You're all on your own.
Ps, it would be great if you can show me the scripture where it says that we are saved by having faith in the work that Jesus done on the cross... Thanks
Jesus said, "Get behind me, Satan! You are a stumbling block to me; you do not have in mind the concerns of God, but merely human concerns."
Why did Jesus say that? Because Satan DID NOT want Jesus to go to the Cross of Calvary. Why? Because Jesus the Christ AND His finished work on the Cross of Calvary is the power of God unto salvation. They are one and the same. You cannot separate the two.
What was the concern Jesus was talking about? I, Jesus the Christ, have to go to the Cross of Calvary there paying the debt mankind owe God and mankind cannot pay.
Apart from the CROSS, I could have absolutely NO LIFE. Before I was saved I was dead in sins and trespasses (Eph. 2:1) and I was separated from the life of God (Eph. 4:18).
How can God remain righteous and holy and completely forgive and pardon the guilty sinner? How is this possible? The CROSS made this possible.
God provided a SAVIOR (Luke 2:10-11).
This SAVIOR became my SUBSTITUTE and took my place.
My SUBSTITUTE became a SACRIFICE when He died on the CROSS for me.
Because of the SAVIOR, the SUBSTITUTE, and the SACRIFICE, I can become a saint (a set apart and saved person)!
Now, instead of judging me, God can forgive me because He already judged His Son when Christ DIED on the CROSS for the sin of the world. The CROSS makes it possible for God to judge sin and at the same time justify the sinner.
The Cross makes it possible for God to accept me
in Christ Jesus and to make me acceptable (Ephesians 1:6).
"For He (God the Father) hath made Him (Jesus Christ the Savior) to be sin for us (He became the sinner’s Substitute), who knew no sin (Christ had no sin Himself but He died for our sins), that we might be made the righteousness of God in Him (Christ)" (2 Corinthians 5:21).
When a person believes on Christ, the righteousness of God is put to that person's account (Romans 4:5).
Now, you can accept Jesus the Christ and His finished work on the Cross of Calvary as God's ONLY way to get to His kingdom or you can reject Him and what He did and make Him subservient to Satan and present the works of your hands which have already been rejected.