All the dead because of Corona should be cremated because only point which has established yet is the virus gets neutralized in fire. There is no research or scientific study done about how long it can survive it buried or if body left to decompose through natural process.
I know it is hard to read or against cultural practices of some, but until the whole biology of the virus is not studied and scientifically proven, only the proven method should be followed irrespective of the religion.
Please note, even in Hindu religion, the cremating happens with lots of people and in wood pyre, which is not going to be the case in this kind of cremation, hence there is no reason to consider it as a decision for or against any particular religion.