I have never met a Christian who actually believes a Christian can be free from sin. Jesus, however, believed it, lived it to show us the way, & died to make it possible for us. He is with us in our failings - Yes. With us in our fallings - Yes. With us in process - Yes. Writing an amazing story about unconditional love & ruthlessly good grace with each of our leavings & returnings - Yes.
But perhaps He is also relentlessly & scandalously hoping for each of us that one day we'll let this mind which was in him also be in us. Oh yes, freedom from sin is possible. But it's not the main goal of the Kingdom.
And as soon as we make sinlessness the main goal, we have sinned against the heart of the King who would rather be with us in our failing than without us in his Kingdom. Even so, when this King invites us to obey, He means for us to obey, & empowers us to obey. I think if we understood obedience as a gift God gives us rather than a sacrifice we give God, we'd be well on our way to that seemingly elusive freedom from sin. If we see the immense value in the storyline God is able to write with our consistent failings, imagine the storyline He can write with our consistent obedience.