We can still have darkness in us. A born-again person in the faith of Christ Jesus will be lured to the things of the world and can still do the same things people who are lost in the world do. It's a battle between the old man/woman and new man/woman.
No we can’t, there is no sin in a Born Again..we have been Born Again of imperishable seed.
When we are Born Again God has brought us from the spiritually dead, to becoming Alive in his Son./ Spirit ..regenerated.........its a battle of the old mindset that’s what’s in opposition to the Holy Spirit...we don’t have our old nature we have a new heart/ Spirit within...we are a new creation in Christ...the sanctification process starts as soon as we are Born Again of the Spirit...we have been adopted into the Kingdom of God..we are children of light......a Born Again Glorifies God and only God.
He is the one who brings us via his Spirit to understand his Living word....there is nothing in us, only in the Spirit, for without the Spirit we are none of his...we are just empty vessels....we all need the Spirit of God and to become Born Again.
Other than that it’s only human understanding of God’s word, which counts for nothing I’m afraid...we need the Holy Spirit to lead us through scripture..
1 John 3:9
1 John 3:9 KJV
Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
1 Peter 1
King James Version
1 Peter, an apostle of Jesus Christ, to the strangers scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia,
2 Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
3 Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,
4 To an inheritance incorruptible, and undefiled, and that fadeth not away, reserved in heaven for you,
5 Who are kept by the power of God through faith unto salvation ready to be revealed in the last time.
6 Wherein ye greatly rejoice, though now for a season, if need be, ye are in heaviness through manifold temptations:
7 That the trial of your faith, being much more precious than of gold that perisheth, though it be tried with fire, might be found unto praise and honour and glory at the appearing of Jesus Christ:
8 Whom having not seen, ye love; in whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory:
9 Receiving the end of your faith, even the salvation of your souls.
10 Of which salvation the prophets have enquired and searched diligently, who prophesied of the grace that should come unto you:
11 Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow.
12 Unto whom it was revealed, that not unto themselves, but unto us they did minister the things, which are now reported unto you by them that have preached the gospel unto you with the Holy Ghost sent down from heaven; which things the angels desire to look into.
13 Wherefore gird up the loins of your mind, be sober, and hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ;
14 As obedient children, not fashioning yourselves according to the former lusts in your ignorance:
15 But as he which hath called you is holy, so be ye holy in all manner of conversation;
16 Because it is written, Be ye holy; for I am holy.
17 And if ye call on the Father, who without respect of persons judgeth according to every man's work, pass the time of your sojourning here in fear:
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;
19 But with the precious blood of Christ, as of a lamb without blemish and without spot:
20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
21 Who by him do believe in God, that raised him up from the dead, and gave him glory; that your faith and hope might be in God.
22 Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
23 Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.
24 For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away:
25 But the word of the Lord endureth for ever. And this is the word which by the gospel is preached unto you.