Remeber the publican.
Besides, there is no sin that prayer cannot forgive, just as there is nothing in earth or heaven that can seperate God from the Christian.
"And the publican, standing afar off,** would not lift up so much as his eyes unto heaven, ***
but beat upon his breast, saying, **God be merciful to me a sinner. Luke 18:13/**B]
He took care of his sin. As a Jew, he knew that the Lord would not hear him if he regarded iniquity in his heart, so he asked for God’s mercy.
Sin that is not repented of, is sin that we are still holding on to. It’s sin that we love more than we love Christ. That is sin that is not forgiven.
**God forgives us when we turn from our sin. ** When we repent.
METANOIA is the Greek word for REPENT found in the NT.
A fundamental change in one’s beliefs: conversion , rebirth , regeneration
Scripture says that SIN does separate us from God.
If it didn’t then our faith would be in vain. There would be no need for salvation.
If there were a scripture that said that sin doesn’t separate us from God, then it would negate the need for Christ’s death on the cross.
The scripture you referred to specifically says that nothing that God created can separate us from the love of Christ.
***Romans 5:8 “But God shows his love for us in that while we were yet sinners Christ died for us.” ***
***“What shall we say then? Shall we continue in sin that grace may abound??? GOD FORBID! How can we who have died to sin still live in it?” *** Romans 6:1-2
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 being killed all the day long; we are regarded as sheep to be slaughtered.” 37* No,** in all these things we are more than conquerors through him who loved us.**
38 For I am sure that neither death, nor life, nor angels, nor principalities, nor things present, nor things to come, nor powers, 39 nor height, nor depth, **nor anything else in all creation, **will be able to separate us from the love of God in Christ Jesus our Lord."