True. But did not Paul also say that he struggled with sin in a very real sense? The verses are well known. Romans 7:18-20 …18I know that nothing good lives in me, that is, in my flesh; for I have the desire to do what is good, but I cannot carry it out. 19
For I do not do the good I want to do. Instead, I keep on doing the evil I do not want to do. 20And if I do what I do not want, it is no longer I who do it, but it is sin living in me that does it.…
So while Paul is NOT saying that we should all just go out and willfully sin, he is saying that it can be a real struggle even for a believer. Anyone who says that he is 100% sinless from the moment that he/she is born again is full of beans. Christ died a brutal death on the cross for our salvation...not just from original sin inherited from Adam but our sin here and now in this life...the one in which we struggle.
It's a matter of heart... God knows the heart of a sincere follower of Christ. No one in this life can judge the innermost heart of a man.