A Saint who gives scripture based worship of the Supreme God to his followers is in essence a Complete Saint. He is the complete knower of all the four Vedas, six shastras, eighteen Purans etc i.e. he will explain their essence.
He imparts the True Mantra (Satnaam / सतनाम) to his followers which can lead to salvation. Read Identification of a True Saint
A Saint or Guru or preacher who does not have the information about the Supreme God is an incomplete Saint.
Therefore that incomplete saint is unable to impart the true path of worship to his / her followers as a result of which the followers are not able to attain salvation / Moksh / Nirvana.
They are not familiar with the Bhagavad Gita or Vedas or Puraans (Vishnu Puran, Durga Puran, Shiv Puran etc.) because in all these Holy Scriptures these Gods themselves accept some other God to be the Supreme God. Read Who is the Supreme God?
Bhagavad Gita, Shiv Puran, Durga Puran and Vishu Puran clarify that Brahma, Vishnu and Shiva are in birth and death. Those who say that Braham, Vishnu and Shiv live for ever and never die are incomplete saints and have no knowledge about our Holy Scripture.
Our Holy scripture i.e. Shrimad Bhagavad Gita, Vedas, Shri Guru Granth Sahib, Bible, Quran Sharif etc clearly prove that God is in form. A saint who preaches that God is formless is an incomplete saint. Read Form of God
Holy scriptures do not profess pilgrimages, carrying out shraadhs, bathing in River Ganga or doing forced meditation. These are arbitrary way of worship and no salvation can be achieved by doing all these activities. A saint who asks his followers to do such things is an incomplete saint.
All the above mantras are arbitrary and have no mention in our Holy Scriptures apart from Om Tat Sat which is a coded mantra. A saint who imparts such naams to the disciples is an incomplete saint and is playing with the lives of his disciples by misleading them.