That's right, Satan has deceived them into believing they can never be free from sin, that they will always be under his desire and dominion. But he also promises them salvation even while serving sin, convincing them they will always be held captive and in bondage to sin while in this world. So why fight the temptations to sin, if that is just the way it is, and if sin has no bearing on salvation, or so they have been falsely led to believe.
So those who are of the world and who love to sin will of course embrace this false doctrine of sin and still be saved, because they can live like the Devil while still believing they are golden and saved. But while Satan promises them freedom, the many are really just being deceived, being also made blind, being led down the broad path of destruction. And they being yet held captive in bondage to sin are convinced by many false teachers that this is just the way it is, leaving them with no hope of escape from this dreadful condition while they are still yet in this world. Satan has filled their hearts with doubt and disbelief concerning what Jesus said He could in fact do, being convinced God's words are not true they have fallen away from the faith.
This being held captive in bondage to sin is like the children of Israel being held in bondage in Egypt by Pharaoh. But when a deliverer comes along like Moses or Jesus Christ saying you can come out of Egypt and be made free, you can come out of the world and be not partakers of her sins, these wicked children say "no you can't, you teach lies and deceit!" So these believing the lies, and these being held captive and in bondage to sin, "say we cannot be made free, we will always be in bondage in Egypt, and we will always be in the world and under it's dominion of sin, because Pharaoh and his sorcerers have said as much, but you instead speak lies and deceit.
And that is truly the sad story for new converts to the faith, they have been told they can never come out of the world and they cannot be made free from sin. Even though God is saying yes you can, believe in Me when I say you can indeed be made free, you can indeed come into the promised land, if you will but only believe and follow Me.
But even still they refuse to listen, even still they refuse to believe.