Another set of questions from you. I see you have explained what you believe so I now realize why you won't or cannot answer my questions in my previous posts to you.
I shall kick off the replies to your questions above.
I do not think that "sin" is inbuilt. Sin is the result of disobedience. We sin/transgress against the State or the country we live in if we disobey the law of the land. The Bible states (Rom 4:15) for where no law is, there is no transgression.
So where there is no law, there is no sin.
Jesus obeyed God's laws (instructions) completely, that means that he never once disobeyed. Therefore, Jesus proved that a person given the correct instruction from the earliest age of being able to understand could follow instruction. Jesus had the very early realization that he was special and would have been told by his mother Mary that he was born of God. This is why Jesus said, when found in the temple; "I must be about my Father's business"
Jesus proved it was possible to lead a sinless life and thereby vindicated God from all those who who say it was impossible. Jesus was not born sinful, yet Jesus had the capability to sin. This is what Makes Jesus man and could not be God, for God cannot sin, because God is not subject to any law. God has given man laws to follow or reject in the same way as man has imposed laws on himself in order for society to function. Maybe if man followed the law of God, society would function better.
Until Adam and Eve were given the instruction "not to eat" they had no instruction to disobey. In other ways, Adam and Eve had choice in that in the Garden they could eat of any fruit and we can assume that there was a variety to choose from. So Adam and Eve had choice in what they ate or did but as long as they were under no instruction, they could not sin. For example you can chose when you want to stand up and sit down, you have a choice and whatever you do, you are not sinning because there is not law to say you must "stand up" or you must "sit down"; whatever you decide to do in this respect, it is your freedom to do whatever.
Now I cannot make you sin. You have a choice. If I said to you for example; "in the next hour you must not sit down" and you decide you are going to sit down and you sit down, then you would have decided to sin against me. I gave you an instruction and you decided that you were not going to obey the instruction. Your decision to sin against me (my instruction) is not something I can make you do. It is the same as you being happy or sad. I cannot make you be happy or sad, it is your state of mind you choose to have.
Jesus showed us how he overcame the temptation to do evil and sin. We can stop ourselves from doing many things that are sinful if we "have the mind of Christ" as the Apostle Paul exhorts us.
When Jesus was in the wilderness having thoughts within his mind of the ways in which he could use God's power to his own advantage, Jesus would overcome the temptation by recalling the scriptures which he had read (often) and which he understood (very well). For example, Jesus says when he was tempted the three times; It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.; It is written again, Thou shalt not tempt the Lord thy God.; for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
We sin against God or society when the laws of God or the laws of the land are not complied with and we do so either sin by commission when we remember what the law,but fail to comply with it, or sin by omission when we fail to remember what the law is and go against the law.
Jesus proved it was possible to lead a sinless life and hence it should be possible for anyone with the correct instruction and who has the will-power to follow instruction to lead a sinless life.
The big problem we have is our own pride, selfishness, greed and headiness. You might call it competitiveness, but why do we need to be competitive? This is one of the great things about the gift of eternal life that God is offering us. Imagine living for eternity in a perfect world - I see no reason for anyone to be competitive when living for eternity in the kingdom of God. It is not like we must "eat, drink and be merry" for tomorrow we die.
As a concluding scripture to summarize and think about:
1 John 2
16 For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.
17 And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.