If one, agrees, the body is not the 'Self', but the 'Self' is birthless Soul, then how can the experience of birth, life, death, rebirth, and reincarnation can be true.+

The waking entity ( ego or you)  is not an experiencer of the waking experience. And the waking entity and the waking world are an experience within the waking experience.  In the same way as the dream entity and the dream world are experienced within the dream. The dream is witnessed as a whole. Similarly, waking also is witnessed as a whole. The witness is neither the waking entity nor the dream entity, but the witness is the Soul, the Self, which is present in the form of consciousness.  From the standpoint of the Soul, the  'Self', all experiences are merely an illusion.  

The witness is formless consciousness, which is real. The body cannot function as a  person and perceive the world without the waking experience. By taking the waking entity as self and judging the truth is erroneous because the waking entity is not the Self and the waking entity and waking world are within the waking experience.  

The waking experience is a parallel dream and the dream is a  parallel waking experience.   In deep sleep, the waking entity and the waking world were missing. Man and his world are present only in waking experience. 

Remember:~

What is that sleeps and gets up when the body is not the Self.  If the one, which wakes up and dreams and sleeps, is not the body, then how can one say, it is the waking entity’s experience, and the waking entity exists only in waking.  

The waking is merely an experience, similar to the dream. The waking is unreal on the base of the soul or consciousness, which is the innermost self.  Therefore, claiming the authorship as the waking entity and judging the truth on the base of the waking entity, will keep one in ignorance of the reality. 

Only if one proves the body or ego is the 'Self', then only the birth, life, and death, rebirth and reincarnation are a reality.  If body or ego is the true self then Advaita has no meaning. There is no need to inquire, ‘Who am ‘I’?’, ‘What am ‘I’?” or indulge in the pursuit of truth.  

If one, agrees, the body is not the self, then how can the experience of birth, life, death, rebirth, and reincarnation can be true because the Self is formless.  

Only if one proves the formless has a birth, and then only it is possible to accept the birth, death, and reincarnation as part of the reality.  Thus, our body-based understanding has to be rectified mentally to grasp the non-dualistic truth.   

For a Gnani, nobody is ever born, nobody is ever lived, and no one ever dies and nobody ever reincarnated, because he sees only consciousness is in everything and everywhere in the midst of diversity or duality or waking and he is fully conscious that,  no second thing exists other than consciousness.   

Diversity has no meaning for a Gnani because he has realized unity in diversity.

Limiting the mind (I) to the physical entity is the cause of all confusion. Therefore, there is a need to know  “what is the mind?” and “what is the substance of the mind?” and “what is the source of the mind?’ to overcome all the confusion. Deeper self-search reveals the fact that the man and the world exist within the mind, and the mind itself is the universe.

Remember:~

By limiting the mind to the physical entity (ego or waking entity) and viewing and judging the worldview, makes one thinks that he is apart from the world, which is the cause of experiencing the duality as a  reality. 

There is neither projector nor projection when one becomes aware of the formless witness, which consciousness the innermost 'Self' because consciousness pervades in everything and everywhere in all the three states as their nondual clay. 

Thus, no second thing exists other than consciousness in all three states. The mind (world) is non-existent from the standpoint of the Soul or consciousness, the Self because consciousness is the formless witness, and also consciousness is the formless substance of the three states. And the formless substance and witness are one in essence. 

Thus,  no second thing exists other than consciousness. Therefore, consciousness is the ultimate truth or Brahman or God in truth.

To realize this simple truth one need not go to any guru, one need not lose himself in a labyrinth of philosophy; one need not spend his lifetime and indulge in guru or god glorification, one need not search truth in the books, one need not renounce his family life.   One has to be in the world, but not of the world.

It is because of our inherited and inborn samskara or conditioning, we are carrying the baggage of the mental junk.  We have to burn all the junk, which is blocking our realization of the ultimate truth or Brahman or God in truth.:~Santthosh Kumaar