What does scripture say?
Jn 3:16 "For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
Jn 3:17 For God did not send his Son into the world to condemn the world, but to save the world through him.
Jn 3:18 Whoever believes in him is not condemned, but whoever does not believe stands condemned already because he has not believed in the name of Gods one and only Son.
Our salvaion does not depend upon our keeping the law
Eph 2:8 For it is by grace you have been saved, through faithand this not from yourselves, it is the gift of God
Eph 2:9 not by works, so that no one can boast.
No One Is Righteous
Ro 3:9 What shall we conclude then? Are we any better ? Not at all! We have already made the charge that Jews and Gentiles alike are all under sin.
Ro 3:10 As it is written:
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There is no one righteous, not even one;
Ro 3:11 there is no one who understands,
no one who seeks God.
Ro 3:12 All have turned away,
they have together become worthless;
there is no one who does good,
not even one."
Ro 3:13 "Their throats are open graves;
their tongues practice deceit."
"The poison of vipers is on their lips."
Ro 3:14 "Their mouths are full of cursing and bitterness."
Ro 3:15 "Their feet are swift to shed blood;
Ro 3:16 ruin and misery mark their ways,
Ro 3:17 and the way of peace they do not know."
Ro 3:18 "There is no fear of God before their eyes."
Ro 3:19 Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world held accountable to God.
Ro 3:20 Therefore no one will be declared righteous in his sight by observing the law; rather, through the law we become conscious of sin.
Righteousness Through Faith, not through works or observing the law
Ro 3:21 But now a righteousness from God, apart from law, has been made known, to which the Law and the Prophets testify.
Ro 3:22
This righteousness from God comes through faith in Jesus Christ to all who believe. There is no difference,
Ro 3:23 for all have sinned and fall short of the glory of God,
Ro 3:24 and are justified freely by his grace through the redemption that came by Christ Jesus.
Ro 3:25
God presented him as a sacrifice of atonement, through faith in his blood. He did this to demonstrate his justice, because in his forbearance he had left the sins committed beforehand unpunished
Ro 3:26 he did it to demonstrate his justice at the present time, so as to be just and the one who justifies those who have faith in Jesus.
Ro 3:27
Where, then, is boasting? It is excluded. On what principle? On that of observing the law? No, but on that of faith.
Ro 3:28
For we maintain that a man is justified by faith apart from observing the law.
Ro 3:29 Is God the God of Jews only? Is he not the God of Gentiles too? Yes, of Gentiles too,
Ro 3:30 since there is only one God, who will justify the circumcised by faith and the uncircumcised through that same faith.
Ro 3:31 Do we, then, nullify the law by this faith? Not at all! Rather, we uphold the law.
So then we are not saved by our keeping of the law, for as scripture says, all have broken the law and are worthy of death and eternal punishment, but God paid for our sins by His offering of His Son to redeem us, not because we had done anything to deserve it, but because of His grace.
We all sin many times in a single day, and most of the time we aren't even aware of our sins. There are sins of commition, such as murder, hating someone, adultry or greed, and there are sins of neglect or ommision such as neglecting to help someone in need, forgetting to offer prayers for others, forgetting to thank God for the thousands of blessings He bestows upon un everyday, and on and on, plus there are sins of eveil thoughts which many doen't even consider, what was it that Jesus said:
Mt 5:21 "You have heard that it was said to the people long ago, Do not murder, and anyone who murders will be subject to judgment.
Mt 5:22 But I tell you that anyone who is angry with his brother will be subject to judgment. Again, anyone who says to his brother, Raca, is answerable to the Sanhedrin. But anyone who says, You fool! will be in danger of the fire of hell.
Mt 5:27 "You have heard that it was said, Do not commit adultery.
Mt 5:28 But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.
So are evil thoughts are grevious sins as well. In conclusion we are all doomed, but those who are in Jesus and trust in His salvation have a clean slate, because they trust in their Savior's forgiveness even when they haven't had time to say I'm sorry or ask for forgiveness before passing on as you said.
Again, our salvation does not depend upon our keeping the law as St Paul said in Romans above, it depends on faith in Jesus and that He paid for all sins, past, present and future