Jesus did come to be obedient to God unto death to overcome Satan, and he came as an example for us to follow and we too are to overcome Satan and deny ourselves bare our cross and follow Jesus.
We are not to just live our lives as we please, thinking were elect and going to heaven regardless of what we do and that we are eternally saved and nothing that we do can separate us from God. That's a false teaching.
The wages of sin is death, and we separate ourselves from God when we sin and we are then of we carry on and love our flesh before him and put ourselves first and keep wilfully sinning, then we can end up dead to him again because we love our lives before God.
Hebrews 10
For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries. He that despised Moses' law died without mercy under two or three witnesses: Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people. ]It is a fearful thing to fall into the hands of the living God.