English is directly descended from German AND Latin. There is more German, but Latin (via French) has had enough influence that you can argue that English is also descended from Latin.
You mean proto-Germanic (from which German also descends), not German. Saying English descends from German is sort of like saying French descends from Italian.
As for the main point: no serious historical linguist argues that English is descended from Latin. Yes, English superficially has lots of Latin vocabulary, but the phonology, syntax, basic words, etc. are still thoroughly Germanic. Phonology being particularly relevant since this thread is about how well an alphabet matches a language's sound inventory.
