Alright ignore psalm 51 I don't really care anymore.
Ephesians 2:2 says that all people who are not in Christ are "sons of disobedience." Ephesians 2:3 also establishes this, saying that we are all "by nature children of wrath." If we are all "by nature children of wrath," it can only be because we are all by nature sinners
Proverbs 22:15 says "Foolishness is bound up in the heart of a child." Genesis 8:21 declares, "...the intent of man's heart is evil from his youth." The word translated youth, signifies the whole of the former part of the age of man, which commences from the beginning of life. The word in its derivation, has reference to the birth or beginning of existence...so that the word here translated youth, comprehends not only what we in English most commonly call the time of youth, but also childhood and infancy."
A final point I would like to make is that if we are born without sin or rightious then it is possible not to sin and to be saved without Christ and the grace of God, which we know can't be true because Jesus said I am the way the truth and the life, no one comes to the father but by me.
The parable of the prodigal son actually answers this question of yours.
The prodigal son was not originally lost;
Luk 15:11 And he said, A certain man had
two sons:
Note how the prodigal turned on his father and rebelled against him. He asked for his inheritance. This amounts to telling his Father that he is dead to him, a tremendous insult.
Luk 15:12 And the younger of them said to his father,
Father, give me the portion of goods that falleth to me. And he divided unto them his living.
13 And not many days after the younger son gathered all together, and took his journey into a far country, and there wasted his substance with riotous living.
14 And when he had spent all, there arose a mighty famine in that land; and he began to be in want.
Note how the prodigal son knowingly and willingly turned on his father and left his home. He went out and wasted his substance in riotous living.
Now note that he "joined himself to a citizen of that country". I believe this represents Satan. This is when a person becomes a child of the devil, a child of wrath, when they knowingly and willingly choose to live a life of sin.
Luk 15:15 And he went and joined himself to a citizen of that country; and he sent him into his fields to feed swine.
16 And he would fain have filled his belly with the husks that the swine did eat: and no man gave unto him.
Many people dismiss parables, but Jesus said that parables contained spiritual truths, hidden from unbelievers, but revealed to believers. These analogies have real applications. This is when the prodigal son joined himself to the devil and became a child of wrath. But he was not that way originally.
I believe a lot of the problem is with the word "nature". Nature can mean the way you are born, your instincts, your constitution. But nature can also mean learned behavior, and most of the time this is what the scriptures are saying. Men learn sin from their parents and those around them.
1 Pet 1:18 Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold,
from your vain conversation received by tradition from your fathers;
Note that Peter says our "vain conversation" or sinful lifestyle was received by tradition from our fathers.
Here is another famous verse used to supposedly prove we are born with a sin nature, that actually says the exact opposite.
Jer 13:23 Can the Ethiopian change his skin, or the leopard his spots? then may ye also do good, that are
accustomed to do evil.
Calvinists especially love this verse, as they claim it proves Total Inability. It does no such thing, in fact, it says the exact opposite.
If men are born with a sin nature that compels them to sin, then these Jews could have justly replied,
"Why do you condemn us for sin Jeremiah? You yourself say we MUST sin, it is our nature, just as a leopard is born with spots, and the Ethiopian is born with dark skin. It is not our fault we have a sin nature, God gave us a sin nature just like he gave the leopard his spots, and the Ethiopian his dark skin."
And you know what? They would be absolutely correct! It would not be their fault that they sinned, but God's if this verse means what Calvinism interprets it to mean.
No, in reality it means the opposite. Jeremiah is condemning these Jews because it is NOT their born nature to sin, but they have chosen to sin, and been so obstinate to refuse to repent that it is as if they were born sinners!
And note that Jeremiah says they are "accustomed" to sin. The word accustomed means a learned behavior, not a natural behavior. Nobody is born with a cigarette in their mouth, and most folks choke and cough the first time they try to smoke, because it is not natural. But if they continue to smoke they become accustomed or used to it, and in time it almost becomes their nature to smoke.
The same could be said with drinking, most folks have great difficulty drinking the first few times, but as they continue to drink they become accustomed to it.
And this is how the scriptures describe men. God has made men upright, but they have sought out many inventions. Men go out and commit sin, and in time it becomes their nature to sin. Men separate themselves from God by sin, and join themselves to the devil by sin. This is what the Bible teaches.