Since the beginning of creation when Adam and Eve sinned by eating the forbidden fruit we have been cursed, and are all born into a sin nature. Sin is any wrong doing in your life, it is any action, thought, or word spoken that is immoral, deceitful, or wicked in the eyes of God.
“Wherefore, as by one man sin entered into the world,” – Romans 5:12a.
Sin includes more than just stealing, cheating, and committing adultery, it is also idolatry, acts such as rebellion, lying, disobedience and unbelief. No one is without sin, no matter how much one tries to keep the wrongs out of their lives, we have all sinned and come short of the glory of God (being perfect to get to heaven on our own).
“For all have sinned, and come short of the glory of God;” – Romans 3:23