If anyone preaches about Hindu religion, then nothing remains to be said for no religion termed as the Hindu religion should exist. If it exists it should be concluded that it has been born. Thus if there is birth, destruction is inevitable, so perishable.

There is no necessity for the preaching of Sanatana Dharma as it is immortal, eternal, non-nascent hence imperishable. So who will teach about that which is imperishable? Similarly who can preach about Bhagavan? This Sanatana Dharma itself only is Bhagavan. Conversance about Sanatana Dharma entails knowledge about oneself. What is eternal, that only is Bhagavan, that only is the self.

Source : www.kriyayogashyamacharan.org