Rom 8:33 Who shall lay any thing to the charge of God's elect? [It is] God that justifieth.
34 Who [is] he that condemneth? [It is] Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us.
35 Who shall separate us from the love of Christ? [shall] tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
36 As it is written, For thy sake we are killed all the day long; we are accounted as sheep for the slaughter.
37 Nay, in all these things we are more than conquerors through him that loved us.
38 For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
39 Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
Sin separated us from God. But when we were "born again" or believed, we became spiritually alive. We were not made righteous by our ability to obstain from sin, or by any works, so it is foolishness (according to scripture) to think that we can lose our righteousness by our works.
Gal 3:1 O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?
2 This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?
3 Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?
Are you guys so foolish? Having had our relationship to God restored by Faith in Jesus Christ, are you going to now say that we are separated again from him by our actions - by our sin?
Since we didn't earn our salvation, it was a gift. God doesn't take his gifts back.
Rom 6:23 For the wages of sin [is] death; but the gift of God [is] eternal life through Jesus Christ our Lord.
Rom 11:29 for God's gifts and his call are irrevocable.
Rom 8:1 [There is] therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
It doesn't get any clearer than that. We are free from the law of sin and death. But just in case you did miss it:
Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
This verse says that God condemned sin to the flesh. This means that - even if our flesh sins, our spirits are alive because sin is banished to the flesh. We who are alive in Christ are never spiritually dead because our sin - our works - are condemned in our flesh and have no effect on our spirit.
Rom 8:10 And if Christ [be] in you, the body [is] dead because of sin; but the Spirit [is] life because of righteousness.