That is just a tradition. It does not mean it is true. You may be offended but that is because its better to stick to truth than given in to manmade traditions. What you may choose to do about this is up to you.
Listen Satan has not been locked up yet! He still exercises much authroity in this world. His Principalities are in charge of different regions of the world where we see false belief systems, communism, terrorism, corruption. We can see cities where crime is out of control.
Your belief is totally wrong. Scholars on both sides, Catholics and Protestants _ across the board _ all agree with this. It is a fundamental belief in Christianity.
>>>You need to digest these scriptures:
Acts 26:18
to open their eyes so that they may turn from darkness to light and
from the dominion of Satan to God, that they may receive forgiveness of sins and an inheritance among those who have been sanctified by faith in Me"
2 Corinthians 4:4
in whose case
the god of this world has blinded the minds of the unbelieving so that they might not see the light of the gospel of the glory of Christ, who is the image of God.
Ephesians 6:12
For our struggle is not against flesh and blood, but against the rulers,
against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places.
2 Thessalonians 2:9
that is, the one whose coming is in accord with
the activity of Satan, with all power and signs and false wonders,
1 Peter 5:8
Your adversary the
devil walks around like a roaring lion, looking for someone to devour.
Eph. 6:11 Put on the whole armor of God, that you may be able to stand against the schemes of the devil.
Do not be deceived! Satan is still in power and prowling around, drawing weak, lost souls into his grasp, influencing them.