Do you still sin, brother?
Yes, as I've already stated. And I've also
overcome sin or temptations to sin that I never would've thought possible-unless for my faith. I don't like saying "no" to me.
But the early church addressed this centuries ago. The earliest Christians had, generally speaking, given up
much in order to be Christians: their positions and status, their wealth, relationships, often their lives. They had turned away from the world and its "values", its sin, as they turned
to God. It was believed, with several Scriptural passages supporting this, that a person who returned to egregious sin: adultery, murder, theft, etc after conversion to Christ could not repent, could not return to the church fold and to fellowship with God again. Sin was taken
very seriously, and this was so across the board with all the early churches. But in the 2nd century a certain bishop, amidst much heated controversy and opposition, and based on a fuller understanding of the mercy and love of God, reversed or altered this trend, teaching that any sin could be repented of even if very harsh penance and much time would be involved before the person would be accepted back as a fellow Christian again. This would eventually become the norm for all the churches.
And the church understood that, while perfection
is the goal and the path we should be on (we weren’t created to sin to begin with, incidentally), this perfection will
not be fully or completely realized in this life. So, again, the faith is not some sort of carte blanche freedom from the penalties of sin, but the very means to
overcome that sin, the means now given to us by God. It’s freedom
from sin, not from sin’s penalties. Past sin is not counted against us; it’s forgiven; now we have a fresh start, united with the only One who can overcome sin within us
due to and by virtue of that vital-and just-union. And God is the
God of fresh starts, BTW, always patiently drawing us to a change of heart and repentance all over again if we slide back away from Him and into sin.
So anyway, there are sins, examples of which are outlined in various passages, that, simply, lead to death if persisted in as they’re so overtly opposed to love of God and neighbor that they destroy love in us, while destroying our relationship with Him. Love is the real get-out-of-hell-free-card as it defines justice or righteousness for man and completes his very purpose as it’s brought to perfection while opposing and excluding sin by its nature.
That's where God and the faith we're given is leading us to.
There are also milder sins that, while still opposed to the will of God, do not inherently constitute an overt turning away from Him. Anyway, this the only way to face the matter of sin head-on IMO and not turn to either antinomianism or some other compromise that doesn’t satisfactorily resolve the issue of whether or not sin can still lead to death as per Rom 6:21, for example.