Romans 8:38-39 does not say that. You're confused.
Rom 8:38-39
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.
KJV
Romans 8:1 is what you're referring to, and IT HAS A CONDITION...
Rom 8:1
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.
KJV
Apostle Paul put that condition in what he said (highlighted there in red). Men's false OSAS doctrines try to omit that condition. They do the same with Paul's condition in Galatians 5 also.