You first try to bring those HIndus back who are leaving anicient Hindu practises and becoming atheist and agnostics oh well then Hindus will say that all path lead toward God so they dont belive in conversion and you can be hindu even if you are atheist and agnostics and all thsi BS.
99.99% of the Hindu "atheist" / agnostic types are staunchly Hindu, celebrate Hindu festivals, retain their Hindu culture unlike those who adopt foreign names, culture and pledge allegiance to foreign states. The founder of Hindutva, Veer Savarkar was an atheist. That's because Hinduism allows one to hold such views, it's not an absolutist religion. you should do some research before you spout off :-
https://en.wikipedia.org/wiki/Atheism_in_Hinduism
Infact, Nasadiya Sukta of the Rig Veda is the earliest known expression of Agnosticism :-
https://en.wikipedia.org/wiki/Nasadiya_Sukta
And "all paths lead to one" is usually quoted out of context. The full quote is :-
Indram mitram varuNam agnim ãhuh,
atho divyah sa suparNo garutmãn,
ekam sad viprãh bahudhã vadanti,
agnim yamam mãtarivãnam ãhuh.
They hail Him as Indra, as Mitra, as VaruNa, as Agni, also as that divine and noble-winged Garutmãn. It is of One Existence that the wise ones speak in diverse ways, whether as Agni, or as Yama, or as Mãtarivãn.
Very very different what Zakir Naik told you about "all religions being true".