We are sinners by nature. We are in the state of sin. We are sinners by imputation. Adam's fall affected each one of us. When God looks upon the human race, He sees Adam and Christ.
Every human being is either in Adam and lost or in Jesus Christ and saved.
Adam is a type, a figure of Christ. He is the first Adam and Jesus is the last Adam. The first Adam was king of the old creation and the last Adam, Jesus Christ, is Lord of the new creation. The first Adam was tested in a perfect garden and he failed. The last Adam, Christ, was tested in the wilderness and succeeded.