That still doesn't explain how the Isles of the Gentiles survived the flood of Noah's..
I don't see what the problem is. Look at the scripture that should explain it. There's more, but that's a start to undertanding it:
Genesis 10 -
This is the account of Noah’s sons Shem, Ham, and Japheth, who also had sons after the flood.
2The sons of Japheth:
Gomer, Magog, Madai, Javan, Tubal, Meshech, and Tiras.
3The sons of Gomer:
Ashkenaz, Riphath, and Togarmah.
4And the sons of Javan:
Elishah, Tarshish, the Kittites, and the Rodanites.
a 5From these, the maritime peoples separated into their territories, according to their languages, by clans within their nations."
Some people claim to be Christian, go to church, like their church, etc., but make fun of the Bible, right? I hope this helps to explain how these "isles" got inhabited. Perhaps you don't quite see that for some reason(?)