Well some of this isn't really knowable, as accounts of Buddhists or Hindus from the overwhelming majority of the Middle Ages are....uncommon to say the least. Indeed in much of the Middle Ages, its likely that most Christians in Europe had never heard of Buddhism or Hinduism and certainly would not have had personal interactions with these religious traditions. Some exceptions to this are of course possible, and merchants that dealt in India and China undoubtedly would run across these groups (even if the majority of the trade along the silk road and Indian ocean was mediated by Islamic merchants), but there is something of a disconnect here, and it would be the inverse of the question you asked!

Other medieval accounts of places like India paint an even more confusing picture. The travel narrative of Sir John Mandeville for example claims that some Indian princes were Christians of a not terribly dissimilar kind to Latin Christians, complete with saying prayers such as the Pater Noster. This is, to be blunt, unlikely.

So as to your specific examples, there is little to go off of, and indeed during the Middle Ages its quite possible that Christians did not even conceive of India as a non-Christian land! But there were of course many non-Christians running around Europe that Christians interacted with. These were mostly Jews, Muslims, and Pagans of various stripes. The actual reception of these groups of people differed immensely over time and place. Being a pagan landowner in rural northern Norway in the 11th century would be very different from being an Islamic merchant in the kingdom of Castile in the 14th century, and both would differ from the experiences of a rabbi in 13th century Germany.

One of the main paradigms that religious toleration in the Middle Ages can be viewed through is called "rough tolerance". While coined to describe the relationship between the Christian sects in the Latin East, Crusader states, it is sometimes broadly applicable to other periods as well. We must also keep in mind, that day to day interactions between different religious traditions were likely quite different than official laws and accounts would have us believe.

For example, ostensibly in much of the Middle Ages, the Jewish populations of Europe were supposed to be protected by the Church. This did not exactly always work out in practice, and sporadic violence against Jewish populations was endemic to Medieval life. Even if Jews were also leaned on for other resources such as financial services as seen in England (before they were expelled by Edward I in 1290), and in places like Poland and Italy, there were still undercurrents of violence and oppression that all too often erupted into violence and murder. However there is also a great deal of evidence for more or less amicable cohabitation, especially in places like high Medieval Spain and Sicily where local churchmen and lawmakers railed against the fraternization between Christians and their Jewish or Muslim neighbors. Indeed women of different sects breastfeeding the children of others was particularly condemned, indicating that this was perhaps a rather common occurrence.

However all of this is rather an overly broad answer because it has to be. It would be easier to narrow down an answer if you have a specific time and place and religious minority in question!