Actually, the Albanians predate the Serbs in the Balkans by a long, long time. However, they were all Christian prior to the Ottoman invasion. 30% of Albanians still are nominally Christian.
Correct. However the Albanians certainly do NOT predate the Serbs in Kosovo. Over the last century they have become a majority, due to their astounding birthrate and immigration from Albania and surrounding regions.
Should you require a rough analogy, the Mexicans of our Southwest will do fine. They certainly predate the Anglos in the region. A small native population, swelled by illegal immigration and a high birthrate has made them into a majority over the past 50 years. Kosovo=Aztlán.
The difference? The Spain lost the territory to Mexico. Then the Mexicans ceded and sold their territories to us. At that time, the territories were very remote and the number of Mexicans very low, just a few thousand throughout the Southwest.
Like the Mexicans in some ways, Albanians prefer to settle in and dominate by numbers those areas surrounding their homeland, rather than develop their own country.