So yes Hinduism in that sense meant everything that
occured in india including Buddhism, jainism, sikhism, yoga, tantra, advaita, vaishnism, shivism,
paganism etc etc..
If this then is to be understood bluntly, just as a matter of course, without the least reservation, to be taken quite unconcernedly and flippantly — then, if
paganism's poetic fiction about the gods might be called human craziness, Christianity might be the invention of a crazy god; such a doctrine could only
occur to a god who had lost his wits — so a man must judge who had kept his wits.