Again,These were the initial converts. But the latter influx of Maronites weren't indigenous. Every Shia speaks of the Jabel Amel and the Banu Amelah. But can every Shia prove he descended paternally from them? I dont think so.
We are a mixture of many races and ethnicities through migration, and conquests and earlier indigenous peoples.
The DNA evidence proves differently. There weren't an influx of Maronites from Syria. Most were converts from missionaries same as missionaries who converted the local people to Shia, Sunni or Druze. Our ancestors were Canaanites who later became Phoenicians.
There is also no DNA evidence (actually DNA evidence proves things differently) that conquests changed the genetics much. If you do your DNA test, the majority of your DNA ( more than 50%) will be Levant others will be dispersed to Anatolian origin (Turkey/Iran/ East Caucasus). Peninsular Arab is very very low as low as 3%.