Non-dualistic or Advaitic wisdom is kept away from religious people who are of lower and middling intellect and made them indulge in karma and Upaasana

Sage Sri,  Gaudapada says that: - The merciful Veda teaches karma and Upaasana to people of lower and middling intellect, while Jnana is taught to those of higher intellect. 

The karma based on the false self is not qualification to Self-Realization.

Thus, it proves that the Non-dualistic or Advaitic   wisdom is kept away from religious people who are of lower and middling intellect and made them indulge in karma and Upaasana.  Thus all the religious prescription  are not means to Self-Realization.

Thus conduct based religions are not the means to Self-Realization because their theories are based on the false self.  Thus, individual conduct and worships and rituals are for the people of lower and middling intellect, therefore religion is for the lower intellect. And wisdom is for those are capable of inquiring into their own existence to know and realize the ultimate truth, which is consciousness.

 Thus, by indulging in Non -Vedic rituals(Puranic Rituals) in place of  Vedic rituals  are enveloped in still greater darkness, in other words, they are extremely foolish, fall into an awful hell of pain and sorrow, and suffer terribly for a long time." Thus puranic karmas are not Vedic karamas as per Yajur Veda.

The puranic karmas are introduced to suit the mass mind set of that time, by the founders of present day Hinduism by keeping the Vedas as their base. They also introduced new modified belief system on puranic GODS with new code of conduct to revive the Vedic religion, which was in ruins in the hands of Buddhism and Jainism.  Thus the present day Hinduism with diverse beliefs is not pure Vedic religion.   Thus, this hotchpotch ideology is greatest obstacle in realization of ultimate truth.  That is why Buddha rejected Vedas.