Satan, the Adversary, the Accuser of the Brethren, is a fallen enemy. He fell when he rebelled against God, and he is fallen ever more.
The only trick he has left is to deceive us from not believe and receiving who we are in Christ:
Christ is simple, and He asked to do one simple thing:
When we believe on Him, we receive two things from Him:
"For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ." (Romans 5: 17)
His righteousness transforms us into a new creation:
"Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new." (2 Corinthians 5: 17)
"For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him." (2 Corinthians 5: 21)
His grace also defines us as a new creation and lets Christ live His life through us:
"But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me." (1 Corinthians 15: 10)
Satan has been judged (John 16: 11), and the weapons which he used against us have been fulfilled at the Cross (Colossians 2: 13-15).
Because we are now seated in heavenly places in Christ (Ephesians 2: 6), we need not fall in with this fallen enemy.