The most sophisticated system of spiritual-religious thought in India is Advaita... and it is also an expression of the most extreme other-worldliness of the kind which has plagued India since the Ayrans came there. Though sophisticated, it is also metaphysical and most of its variants (and proponents) are distant from all social human concerns. It is all about the desire for liberation (cessation of existence in the world). It ought to be taken apart systematically on all fronts so that gurus and other people living in the past and its superstitions etc. get the rations ground cut away beneath their feet... for this is their main appeal in the West, the involved ideology and labyrinthine meanderings of speculation so as to explain all and everything without any science or empiricism.
I have posted a number of articles criticising Advaita, such as the following:-
Some reflections on Advaita Vedanta
The so-called 'spiritual search' - subjectivist 'teaching' about th...
Mental double-accounting: 'spiritual doublethink' in indoctrination