Why do I mention the error, in what persons are presenting?
Well this is the spirituality forum and when discussing religion and the spiritual life, there is the authority and there is the substitute authority, and any error in your teachings shall misdirect you away from true spiritual understanding and affect your ability to develop genuine love for God.
Error will have the person develop feelings of a sentimental nature, instead of acquiring genuine loving sentiments towards Godself.
The substitute authority is any teaching, that is presenting knowledge which is in error.
The substitute teaching is presenting error, because the compilers of that teaching are not qualified to determine what is actually true, and with their conditioned mind and superstitious disposition, they convince themselves that any thoughts and ideas coming from their minds are true.
And then they write these ideas and thoughts down, and then proceed to sign Gods name to these writings, saying that God has spoken to them, by way of an Angel or a voice coming from the darkness.
Many are seeking personal aggrandizement, and persons in positions of power are seeking control over the people.
You have to remember that thousands of years ago these person had very limited knowledge of even their secular situation, as well as their metaphysical.
The rulers knew, that whom ever had God under their thumb, had also the people under the thumb as well, so with that understanding they proceeded to give the people the law of the land and the law of God.
Now in India back then, Vedic influence was serving the people of India, but because of the age of Kali which started 5000 years ago Vedic knowledge was on the decline and religious principle were being ignored, and because India does not have a history of conquering others, the Vedic influence had not really left its borders, so the authority of the Vedic teachings more or less remained a hidden secret with India.
There was a large learning facility in Afghanistan at Kandahar at the time, and Vedic influence was established there, but as for other places it was mainly absent, and in that facility which was a university of some soughts, it has been suggested that the man Jesus travelled and studied.....and this is how he had far superior knowledge of God.
Anyway substitute religion instead, was presented far and beyond because of the influence of the rulers who were always conquering different places and taking their newly fabricated religion with them.
This new religion had everything a person desired, and the main feature for attracting initiates was the magical blood that would take away sins, even the sins that have not yet been perpetrated.
No other religion had a saviour that could raise the dead, walk on water and take away your sins so you can go straight to heaven, without actually living a spiritual life.
If you refused the free ticket to heaven, you would be found to be a witch and burned at the stake, also persons who were a little thoughtful and could see through the errors in this new religion, were accused of blasphemy if they exposed the errors in this new teaching..
Whilst all the blood flowed........ the real bonafide teachings of Vedanta, were being stolen or burned or hidden from the people, by the British and the Germans and others, for they could see that these perfect and authorized teachings of true religion, would easily expose the false substitute religions that were being spread all over the world.
Now in the 21st century this error is still being presented to-day, and people are still being presented with a free ticket to heaven and magical blood, that shall still take away all sins for all people for all times under all circumstances without having to live a spiritual life.
Error can easily be detected in any religious teaching, and the way to detect error is......take a massive amount of honesty vitamins, a massive amount of truthfulness vitamins, a massive amount of sincerity vitamins, take a massive amount of genuineness vitamins.....and you will be able to see clearly what is error, but that is only the beginning, because to actually be able to understand the spiritual knowledge presented by Vedanta, that often may be beyond the mind and senses, you must live the spiritual life for the purification to take affect, which will afford you with the spiritual insight necessary for developing higher understanding.
Without purification of the heart, the knowledge will remain unrealized knowledge, and will then lack the potency to elevate the person to the transcendental platform of self realization.
Once you have found all the erro remove it from your substitute religion, and what you have left follow that with your heart and soul. But if you find that you do not have much left, then simply take to the First,Original, Bonafide, True and perfect religion of Vedanta Sutra by Srila Vyasadeva... ( but be careful of unauthorized versions of Vedanta Sutra by Srila Vyasadeva)