It seems a bit redundant to talk about sin. The truth is because we keep seeing it, it needs to be discussed. We are seeing it in what is called "the Church" and "the body of Christ". What many do not realize is that sin is infectious and the body of Christ does not keep infections. Infections are extracted.
A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Matthew 7:18-19
Corrupt fruit is sin. There are many who love to say God is good as they continue in their sin. They are doing that one "thing". You know that one sin they are waiting on God to deliver them from or praying that He removes the desire or taste from them. The fact is salvation is being rescued from sin. There are far too many continuously using excuses to justify their sin. The truth is when you are in sin, you are not saved.
Sin is an ongoing growing epidemic with an over simplified cure. The cure is to leave it alone. Many say they're trying, they are working on it, they doing their best and they're a work in progress. These are all excuses or reasons to continue the act against God. There must be a knowing that sin is a choice and when there is sin in one's life, there's no righteousness in them. For those who choose to sin, know that sin is a transgression against God. When what is done is not what God commanded, it is contrary to God's law. Anything opposite of what Jesus taught is sin and does not show that you are saved. It is considered sin because when we learn what Jesus says we must do it.
If you love me, keep my commandments. John 14:15
Any act that is opposite of what is righteousness, regardless of what is considered pros and cons, is sin when what is righteous is known. If one considers themselves to be a believer, they are accountable for every choice to do or not to do. We are without excuse. Grace only excuses what one doesn't know. It does not excuse what is known. When you are a believer, you are saved. When you are saved, you cease from sin. When you cease from sin, you no longer do it.
The question remains, how can you call yourself a Christian when you sin? When you sin, you are not saved. Be removed from sin and then you are saved.