Most linguists formally classify English as Germanic (West Germanic, alongside Frisian, Dutch and German, though one Norwegian linguist made a case for it being North Germanic), though some people refer to it as a Romance-Germanic creole. It is quantifiably true that, if you want to read Old English, knowing Icelandic will be more helpful than knowing modern English.
When I was a child, I spoke like a child. Now I am a man and I speak like the King of England!
English is three different languages in a trench coat. It’s all borrowed to some degree.
Most linguists formally classify English as Germanic (West Germanic, alongside Frisian, Dutch and German, though one Norwegian linguist made a case for it being North Germanic), though some people refer to it as a Romance-Germanic creole. It is quantifiably true that, if you want to read Old English, knowing Icelandic will be more helpful than knowing modern English.