Although many choices are open to a devout Christian, many are closed when we want to love and obey Jesus Christ. Whatever the Bible clearly terms as evil is forbidden, and such prohibitions remain the same in every culture and despite our different personalities. Lying, fornication or having sex outside of marriage between a male and a female, stealing, drunkeness, are some of the few practices that are called evil by the Holy Spirit who inspired the Bible.
So why do some claim that these and other acts and attitudes called sin are really acceptable to God. I understand why one may champion sins when one does not accept the Bible as the Word of God, and one does not believe in the Bible. But when sins are clearly called rebellion against God, no one who is a friend of God, or who hopes to be a friend of God, can embrace them.
We who are converted supernaturally to follow Jesus Christ, and only such individuals are Christians, by the way, can and do the opposite of what we know is right many times. Even if we do not murder or do other heinous crimes, we get selfish or crabby or impatient or unkind, etc., daily. We repent of these attitudes and whatever else the Holy Spirit calls sin, if we want to have peace with God. To say we can sin and still have peace with God is not true at all. Repentance is totally necessary in order to be holy acceptable to him. Be holy is commanded, it is not a suggestion. To be holy is to do and to be what prefer the Bible says to be and to do, and to turn away from whatever the Bible says is unholy or evil. The Pharisees were good people in their own eyes, for they kept the law at least on an external level. But inside they were not loving or obeying God at all, or they would have repented and turned to follow Jesus Christ as God and Lord. Some did, such as Nicodemus, and Joseph who owned the tomb where Jesus was temporarily buried.
When we do repent of our sins and turn from them to follow Jesus Christ, we have his supernatural peace. We are not locked into holiness after that, we have a civil war since then the nature of God within us constantly wars against the human nature we continue to have as a Christian. But we who are Christians know better than to call evil what the Bible calls good, or to call good what the Bible calls evil. We may do that in a cowardly moment of weakness, but we will promote holiness internally and externally as defined by God in the Bible, not as defined by whatever culture we live in.