The Rigveda 10.164.46 states:
ekam sad viprA bahudhA vadanti agnim yamam mAtrishvAnam Ahuh ||
The sages describe the one existence (ekam sat) in many ways. It is called as Agini, Yama, MatrishvAn.
But these forms are no longer worshipped by most hindus regularly in spite of being mentioned as the Forms of the Supreme God by the Highest Authority!
Indra is also such a form Who was glorified by the Vedas.
What is the reason behind this?