" . . . And when I see the blood, I will pass over you . . . "
The angel of death still stalks all those who are out of covenant with Christ (and His church). But those redeemed souls whose hearts are sprinkled by the blood of Jesus are safe--God passes over them, while He executes judgment on others.
It is not your "righteousness," your religiosity, your civility, nor your morality that causes God to pass over you, and spare you from judgment, hell, and damnation. Instead, it is only the blood righteousness of the "Lamb of God who takes away the sin of the world," (Jn. 1:29b). This righteousness is imputed to the hearts of sinners, by grace through faith in Christ.
[Puritan quote of the day: "Make it your main business, your chief study, your greatest care, to 'make your calling and election sure,' says the apostle." --Thomas Brooks, in "Heaven on Earth"]