To criticize the Vedic teachings is offensive

"Sruti substantiates the nine ascertainable teachings, and the guru who is well versed in the scriptures is able to reveal these truths. Anyone who criticizes the srutis commits a heinous crime. He is a sinner and an offender to the holy name.

"Jaimini, Kapila, Nagna, Nastika, Sugata and Gautama are six philosophers who were stuck by the fangs of mundane logic and reasoning. They simply did some lip service to the teaching of the Vedas, but they did not accept God. Jaimini propagated that the best knowledge the Vedas has to offer is the fruitive ritualistic portion known as karma-kanda. Kapila dared to state that God was imperfect; he accepted the process of yoga, but without understanding its deeper implications. Nagna spread poison by teaching a practice of tantra that is in the mode of ignorance. Carvaka Nastika was an atheist who never accepted the authority of the Vedas, and Sugata the Buddhist imposed a different meaning upon them. Gautama propagated logic and did not worship the Supreme Lord.

A materialist identifies the person they love with the physical body that person inhabited. Therefore when that person or atma leaves their body and just a corpse remains, the materialist will not know what to think. He will be frightened and confused by the corpse -- because although the body is present, his beloved is not.
Science of Identity Foundation | Chris Butler Speaks

"These mischievous interpretations are in fact offenses against the Vedas. Through sophism, such philosophers speak half-truths that are likely to confuse the ordinary listener, though an experienced Vedantist can easily detect their ruse. Avoid dabbling in such philosophical concepts because they are detrimental to spiritual growth. The mayavadi philosophy is equally dangerous, for it suppresses the natural devotional mood. Mayavadi philosophy is factually camouflaged Buddhism. In Kali-yuga the propagation of this philosophy, which is a perversion of the Vedic truth, has been authorized by the Supreme Lord. On the Lord's behest, Lord Siva became its propagator. As Jaimini seemingly upheld Vedic authority but practically propounded a warped version of the Vedic conclusions, similarly mayavadi gurus give Vedic proof to establish their covert Buddhism; thus they obscure the essence of the Vedas, which is the science of devotional service.

"Astavakra, Dattatreya, Govinda, Gaudapada, Sankaracarya and all of Sankara's materialist-philosopher followers are known