Serbian Church: The Serbian Kingdom and then the state tried hard to Serbianize the Bulgarians of the current Republic of Macedonia. When it could not finish the job, Belgrade encouraged the creation of a fake Macedonian nation, culture, and language, and endorsed the establishment of the Church of Macedonia as an autonomous Church under its wing. However, the Macedonians went very far to the Serbs when they declared autocephaly: they cannot let that mouse get away.
Bulgarian Church: The Bulgarian Church could not relinquish its historical claim on the lands covered by the Bulgarian Exarchate of the late 19th Century. Also, recognizing the Macedonian Church would perpetuate the myth of a distinct Macedonian language. Just like their neighbors West and South, most Bulgarians would be extremely unhappy. Again, they cannot let that mouse get away.
Four issues with what you are saying:
1. The existence of the Macedonian people. I don't want to get too far off the topic of religion here, so forgive me in advance if I go off on a tangent. That said, there are documents that have been uncovered in various libraries referring to the existence of a Macedonian people that I've seen dating to 1400 or so. Furthermore hi "Ignea" released a DNA study in 2008 and came up with something of a typical genetic profile for a Macedonian with the following DNA results:
The irony, of course, is that Greeks have more Slavic DNA (I believe it was 20%) and less Macedonian DNA (5%; 18% in the North). If this is accurate, that makes a good case for the existence of a Macedonian people.
2. Creation of the Macedonian Nation: Nobody can encourage creation of anything without popular support. I will not argue that the Serbians engaged in anti-Bulgarian propaganda, however, if the Macedonian people didn't naturally feel that way I doubt that a "fake" nation could be created.
3. Existence of a Distinct Language: Here is a video of the 100th anniversary celebration of the first Bulgarian parish in America (largely started by people who would call themselves Macedonians today): http://www.youtube.com/watch?v=2p5rPJrxHTE
There is a banquet video where the bishop gives a speech. To my first-generation ears, he is basically just as unintelligible as a Serb is. I can, however, easily understand the dialect in Greek Macedonia.
4. I have no problem with being called Bulgarians as that is how you were identified in Ottoman times--based on your ecclesiastical jurisdiction encompassing many different tribes. However one should realize that Europ is far from homogeneous-. Bulgarian could mean either Bulgarian ethnicity or Bulgarian nationality. If you dig deeper in tthe people calling themselves Greeks, they were Patriarchists who were of various backgrounds with Vlachs being among the largest groups. It was a surprise to me when i first learned all this, as I thought if you said "Italian", for instance, it meant something, but it really doesn't. European countries are heterogeneous not unlike America.