The Advaitic orthodoxy is based on a personal God whereas Sage Sankara’s Supreme Brahman (God in truth) is impersonal+

The Advaitic orthodoxy is based on a personal God whereas Sage Sankara’s Supreme Brahman (God in truth) is impersonal, Nirguna (without Gunas or attributes), Nirakara (formless), Nirvisesha (without special characteristics), immutable, eternal, and Akarta (non-agent). God in truth is above all needs and desires. God in truth is always the Witnessing Subject. God can never become an object as God in truth is beyond the reach of the senses. God in truth in truth is non-dual, one without a second. God in truth has no other besides it. God in truth is destitute of difference, either external or internal. God in truth cannot be described because description implies a distinction. God in truth cannot be distinguished from any other than God in truth. In God in truth, there is no distinction between substance and attribute. Sat-Chit-Ananda constituted the very essence or Swaroopa of God in truth, and not just God's attributes. The Nirguna Brahman of Sage Sankara is impersonal.

Advaitic orthodoxy accepts the experience of birth, life, death, and the world as reality, whereas Sage Sankara declares the world is unreal Brahman alone is real.

Thus, the experience of birth, life, and death happening within the unreal world is bound to be a falsehood. 

Thus, the religion and religious belief and its ritual based on the birth entity are bound to be a falsehood. Thus, the seeker has to realize ‘what is that is real and eternal?

Sage Sankara: ~ ‘Reality can be realized only with the eye of understanding, not just by a scholar. What the moon is like must be seen with one's own eyes. How can others do it for you?"~Vivekachoodamani

Advaitic Orthodoxy misinterpreted Sage Sankara and presented only the religious side of his teaching as the highest doctrine. Thus, people are misled.  

The orthodoxy is based on rituals mythical Gods and Karma. Advaitic wisdom of Sage  Sankara has nothing to do with Advaitic orthodoxy.

Let Advaitic wisdom annihilate ignorance (I) and reveal Soul, the Self the God in truth.  Let your ears become deaf to the untruth propagated by the religion as a reality; enable you to realize the truth hidden by the ignorance (I).  Let your eyes become blind to the illusion of receiving the Soul as the Self as it is in the midst of the dualistic illusion. 

All the orthodox ideas were rejected by Sage Sankara. There is no need to indulge in rituals, to realize the ultimate truth or Brahman. There is no need to study philosophy, to realize the ultimate truth, or Brahman then why indulge in studying philosophy.

Sage Sankara pokes fun at ascetics and points out that all their austerities do not cause desires to go (Altar Flowers" Page 205, v.2 P.207 v.4)

Sage Sankara pointed out that those rituals could in no way bring about wisdom, much less moksha.

Sage Sankara says the rewards of the rituals were not a matter of direct realization. The Advaitic wisdom is based on personal realization.

The orthodox Advaitin believes that rituals alone would lead one to higher levels of attainment. Further, the deities would reward only those entitled to perform the rituals alone. The entitlement involved caste, creed, and other parameters.

The scriptural authority and value of rituals are part of the Advaitic orthodoxy, which is meant for ignorant people.

The Advaitic wisdom of Sage Sankara has nothing to do with religion, caste, rituals, worship, yoga, and other practices. Therefore, an obvious disparity between Sage Sankara‘s path of Gnana and the path of Karma. 

The path of Gnana is meant for the advanced seeker of truth and the path of Karma is meant for the ignorant populace.

Even Sage Sankara appears and tells the orthodox people the path of orthodoxy is the path of ignorance they will not be able to drop their inherited samskara or conditioning, which they think is the only way to reach heaven and reap a happy life in the next life. 

As regards the rituals, Sage Sankara says, that the person who performs rituals and aspires for rewards will view himself in terms of the caste into which he is born, his age, the stage of his life, and his standing in society, etc. In addition, he is required to perform rituals all through his life. However, the Self has none of those attributes or tags. Hence, the person who superimposes all those attributes on the changeless, eternal Self and identifies the ‘Self’ with the body is confusing one for the other; and is, therefore, an ignorant person. The scriptures dealing with rituals, rewards, etc. are therefore addressed to an ignorant person.-  (11- Adhyasa Bhashya)

First Mundaka - Chapter 2 (10) - Ignorant fools, regarding sacrifices and humanitarian works as the highest, do not know any higher good. Having enjoyed their reward on the heights of heaven, gained by good works, they still remain in ignorance of the Atman the real God. 

As a person, one performs rituals throughout his life.  The person who performs rituals and aspires for rewards will view the world in which he exists as a reality. However, the Soul, the Self unborn eternal hidden by the world in which he exists.  From the standpoint of the Soul, the world in which he exists is merely an illusion.  The scriptures dealing with rituals, rewards, etc. are therefore addressed to an ignorant person.  

First Mundaka - Chapter 2 (9) - Children, immersed in ignorance in various ways, flatter themselves, saying: We have accomplished life's purpose. Because these performers of karma do not know the Truth owing to their attachment, they fall from heaven, misery-stricken, when the fruit of their work is exhausted.

First Mundaka - Chapter 2 (8) - Fools, dwelling in darkness, but wise in their own conceit and puffed up with vain scholarship, wander about, being afflicted by many ills, like blind men led by the blind.

Ish Upanishad declares: - Those people who have neglected the attainment of Self-knowledge and have thus committed suicide 10/11/12

The religious orthodox people who have neglected the attainment of Self-knowledge and have thus committed suicide, as it were, are doomed to enter those worlds after death.

This is a condemnation of people who do not try to attain Self-knowledge. They are, in a real sense, committing suicide, for what can be worse than being a slave to sense enjoyment, completely oblivious of the real purpose of life, which is to be one’s, own master?

The Soul is unborn eternal, because, it is ever formless, timeless, and spaceless existence.:~Santthosh Kumaar