1 John 3:6 states: No one who lives in him (Jesus) keeps on sinning. No one who continues to sin has either seen him or known him. My question: a believer who believes and accepts Jesus as savior but because of weakness or struggle, slips up and sins fairly often but also confesses and repents, is that believer thought to have a sincere conversion to Christ and still sins because of the sin nature (Roman 7:14-25) or maybe has not received a genuine conversion because of still sinning often (not seen or known Jesus due to continued sin)
Hello Christiansoccerplayer, while God gives us a new nature when we become believers .. e.g.
Ezekiel 36:26-27; John 3:3; 2 Corinthians 5:17, sadly, our old nature (our
old self/old man) remains, and it rears its ugly head as often as we allow it to

This is why we are told to
put off the old man and to
put on the new, as a daily/moment by moment choice, a choice that we could not make before we were in Christ .. e.g.
Ephesians 4:22-24.
Continuing in unrepentant sin as a lifestyle choice is a pretty good indicator that a person is not saved, even if they 'claim' to be a Christian, while being grieved over sins and continually seeking God's forgiveness for them
(by confession/repentance) is a pretty good indicator that a person who claims to be a Christian actually is one.
Finally, you might want to consider what the elder Apostle has to say about this in Chapters 1 & 2 of the same Epistle. He wrote these words to Christians
(of all levels of maturity in the faith). BTW, be sure to take note of the fact that St. John included himself in the mix with the rest of us
(see the words in bold below).
1 John 1
8 If we say that we have no sin, we are deceiving ourselves and the truth is not in us.
9 If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make Him a liar and His word is not in us.
1 John 2
1 My little children, I am writing these things ~to you~ so that you may not sin. But if anyone does sin, we have an Advocate with the Father, Jesus Christ the righteous;
2 and He Himself is the propitiation for our sins; and not for ours only, but also for those of the whole world.
12 I am writing to you, little children, because your sins have been forgiven you for His name’s sake.
13 I am writing to you, fathers, because you know Him who has been from the beginning. I am writing to you, young men, because you have overcome the evil one. I have written to you, children, because you know the Father.
14 I have written to you, fathers, because you know Him who has been from the beginning. I have written to you, young men, because you are strong, and the word of God abides in you, and you have overcome the evil one.
God bless you!
--David