We are told that humanity has a karmic backlog of deep trauma that will take 40 years to heal once the interlopers have left us alone. When that time period is over and assuming we will be successful, will ALL of incarnate humanity then be without sin, like Jesus and Mary when they were born?

This will be true for all who seek for this to happen. This period you speak of will be one of growth and change, education and assistance by many who will step forward to spread the word, to show the way, and to make available healing assistance for the masses. There will still be some who resist because of their programming and they may well fall behind. If there is a decision to not take part in the ascension, that will be allowed. So there will be some who choose not to be a part of the growth and ascension that will be coming—that is free will in action and will be allowed. It still does not mean they will be banished or behind the others forever. There will still be outreaches made to them and offerings just as happens now for spirits lost in limbo who lack a sufficient vibration to return to the heavenly realm following their passing—they are never forgotten. Those humans who ascend will continue to be in a position to be of service to their brethren who may lag behind and are in need of rescue and healing interventions. So it will not be so different for them from what is happening to the whole of humanity at the moment being in an imperfect place with a considerable headwind slowing down progress and enlightenment. But the vast majority of humans will answer the call, will become awakened, and will do the work needed to help themselves advance, to be in position with enough healing to be a part of the final push that will serve to wash away old karmic issues for all of time. There may be long-term issues still in play for some, but these can still be worked on in the future wherever they end up going. So there will always need to be an investment made by the individual to see to their karmic backlog because it is their personal responsibility, first and foremost, because they were a party to what has happened for them even when victimized, by in some way being vulnerable and not strong enough to avoid damage. The old souls among you are quite used to this paradigm, but this is part of what makes you all great, that you have taken on such challenges and such risks to even be wounded and impaired and suffering for extended periods of time in service to the light and your own enlightenment along the way, as a consequence of being wounded again, and again, and again, and needing repair. The same circumstances that drag you down and cause you harm are teaching you about healing and about the power of love to heal all wounds and raise up everyone to a better and more exalted state of being. This is why you have all volunteered to be a part of the human enterprise, knowing the future destiny that will result from a successful engagement with forces of evil to win the day.