Without getting into a "right/wrong" argument .... a little background ....
In the strictest form of a Hinduism cremation ceremony, the oldest male child will light the pyre and then crack the skull of the deceased with a single blow with a bamboo pole.
This, in their belief, releases the soul of the deceased and allows it to proceed on its way.
It is for these reasons that this man thinks an "english" cremation is unacceptable
Many religions of the world have some form of cremation/funeral pyre and this is, in a social history sense, actually based on hygine/practicality .. in hot parts of the world human flesh decays rapidly and is a source of infection, so a pyre/cremation soon after death is a way of reducing the possibility of spreading infection.
It is now called "religious belief" .. but as in many religous practices .. can be traced back to when the "leaders" of societies were the educated "priests" (for want of a better word) and they "made" folks do many things that benefited their societies by making them part of "worship"....
as a few examples....
"Ritual cleansing" forced peasants to wash before eating, so reducing illness
"halal" meat ... where all the blood is drained from a carcass, enables the meat to be kept longer without going off, so reducing food poisoning
"cremation" .. already discussed
There are many more, in different religions, and just because we don't understand them, or agree with them, is not reason enough to disparage them.
It used to be called "understanding" .... :-/ :-/ :-/