From the Ancient Heritage to India and the Modern West, A Cultural History of India, edited by A.L.Basham is an exhaustive and valuable book on the subject.
The chapters include, Asokan India and the Gupta Age by Romila Thapar, on Hinduism by S.Radhakrishnan, Islam in Medieval India by S.A.A.Rizvi, Islamic Reform Movements by Aziz Ahmad and Modern Literature by Krishna Kripalani.

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The cultivation of love of humanity was one of the dominant characteristics of most systems of Indian theism. The Christian principle of love and equality is anticipated in Buddhism and Bhagvatism, which flourished in India long before Christ; but the force of innate sin is not emphasized as it is in traditional Western Christianity.
--(Philosophy) A Cultural History of India, edited by A.L.Basham.