Because Jesus told the Pharisees and Saducees they were of their father, the devil. He also told them they were not of His sheep, and His word had no place within them. He also stated in John 17, He did not pray for the world, but for those "Thou hast given me", and also for those who would believe their words.
OK, read the parable of the prodigal son. Was he a child of the devil at first? NO, he was a son of his father until he willingly and knowingly chose to go out in sin. Only after he chose to sin do the scriptures say he was joined to a citizen of this far country.
Luke 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.
17 And when he came to himself, he said, How many hired servants of my father's have bread enough and to spare, and I perish with hunger!
18 I will arise and go to my father, and will say unto him, Father, I have sinned against heaven, and before thee,
19 And am no more worthy to be called thy son: make me as one of thy hired servants.
20 And he arose, and came to his father. But when he was yet a great way off, his father saw him, and had compassion, and ran, and fell on his neck, and kissed him.
21 And the son said unto him, Father, I have sinned against heaven, and in thy sight, and am no more worthy to be called thy son.
22 But the father said to his servants, Bring forth the best robe, and put it on him; and put a ring on his hand, and shoes on his feet:
23 And bring hither the fatted calf, and kill it; and let us eat, and be merry:
24 For this my son was dead, and is alive again; he was lost, and is found. And they began to be merry.
Did Jesus say the prodigal son was born a son of the devil at first Willis? NO, he was born in his house a son of the father which represents God.
Only after he chose to sin was he joined to a citizen of that far country, I believe this represents the devil or Satan.
Did the prodigal have to be regenerated to repent? NO, the scriptures say he "came to himself" and started home. His father saw him a great way off (foreknowledge).
When he came to his father, he immediately put a ring on his finger (sonship), a robe on his back (righteousness) and shoes on his feet (the Christian's new walk).
But note that the father said the boy was alive AGAIN Willis. That means he was alive BEFORE. He was not born dead in sin, and he was not born a child of the devil as Calvinism falsely teaches.
No, he was originally a child of God, but he went out in sin and spiritually died. This is when he became a child of the devil.
But when he repented and trusted his father, his sins were forgiven and he was made alive AGAIN.
Tell me Willis, how do you explain Jesus's words that the prodigal was alive again?
Do you admit that this parable shows men are not born dead in sin, and that men are not born children of the devil?
Please answer those questions Willis.