That as sin hath reigned unto death, even so might grace reign through righteousness unto eternal life by Jesus Christ our Lord. - Romans 5:21 KJV
After Adam and Eve sinned, they lost the perfect nature with which they had been created, and they acquire a sinful nature. Sin was spread to all human beings:
For all have sinned, and come short of the glory of God; - Romans 3:23 KJV
Today humans are not sinners because they kill, steal or lie. They do so because they are sinners; if they were not, they would not commit sin.
The apostle Paul says that evil actions are a product of the sinful nature:
19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, 20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, 21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. - Galatians 5:19-21 KJV
The starting point is humanity´s distance from God.
Behold, I was shapen in iniquity; and in sin did my mother conceive me. - Psalm 51:5 KJV
We are all sinners by nature. it is easier for us to do evil than it to do good:
19 For the good that I would I do not: but the evil which I would not, that I do. 20 Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me. - Romans 7:19-20 KJV
Based on I WILL GO by Alejandro Bullón