’m a firm believer that it’s not our desires or temptations that define us, rather it’s what we choose to do with them that makes us who we are.
“Then the Lord saw that the wickedness of man was great on the earth, and that every intent of the thoughts of his heart was only evil continually. The Lord was sorry that he had made man on the earth, and he was grieved in his heart.” - Genesis 6:5-6
“You shall not covet your neighbor’s house; you shall not covet your neighbor’s wife or his male servant or his female servant or his ox or his donkey or anything that belongs to your neighbor.” - Exodus 20:17
“You shall not hate your fellow countryman in your heart…you shall not take vengeance, nor bear any grudge against the sons of your people…” Leviticus 19:17-18
"You have heard that the ancients were told, “You shall not commit murder” and “Whoever commits murder shall be liable to the court. But I say to you that everyone who is angry with his brother shall be guilty before the court…” - Matthew 5: 21-22
“You have heard that it was said, “You shall not commit adultery;” but I say to you that everyone who looks at a woman with lust for her has already committed adultery with her in his heart.” - Matthew 5:27-28
“Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers nor effeminate, nor homosexuals, nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers will inherit the kingdom of God.” - 1 Corinthians 6:9-10
Yes, our desires (concupiscence) is sinful. People who try to make the distinction between desires and actions for the purpose of balancing their account with regard to sin are making a distinction that God doesn’t make, and they will be held accountable for sinful desires. Sin is not something manageable. It is serious, and it is deadly for us. We are spiritually dead in our sinful nature and that includes our desires. It is only through Christ that we are forgiven and acceptable before God.