I’d suspect a political/economic component. Christianity, because it stresses the individual, it is often seen as a threat to established structures that stress either the state or a group.
Christians, in particular Catholics, have often been attacked in Hindu areas of India because they were perceived as violating the economic status quo simply by ignoring the caste system (which, while technically forbidden by the Indian Constitution, remains very much alive, especially in rural areas).
I would suspect that there is some kind of nationalist/political/economic motivation behind this Buddhist attack. It may be that the outlook of Buddhism combines well with Communism (the Marxist guerrilla movement is very active there), but less well with Christianity, and at some point they came into conflict.
What bothers me about articles like this is the narrow slices of reporting that we get, the defining of so-called reality in the wording. It's an effort on the part of the global socialists to blame all of man's grievances on religions. I contend, that even if there were no religion, there would still be war, violence and suffering...it's a human thing not a belief system or a geographical area or any one set of people that cause it.
The pervasive socialist/atheist/communist model, if it continues to gain momentum, will only serve to make a few new humans gain power over the others but it will not change the nature of humans. There will still be wars and poverty and class systems and all things unacceptable to mans better nature.
Most of the strife we see in the media is only a very small select piece of the pie. It's just a political illusion.
The commies were always very good at illusions and they have foisted their brand of reality in many different countries over the decades, including India. The Russians have admitted as much. They even have a name for it...psychological subversion.
If there is any trouble between people, look for the commie elements to point out the parts that fit their agenda. Two people could be fighting over a cow in India, but if they are of two different religions, it will be announced from the rooftops, will the brutal rape and murder of someoe who was of the same faith down the street goes unreported leaving the unspoken impression that mankind urgently needs to rid itself of the scourge of all faiths. It is part of the manifesto.