@Olivier5,
Lets for the sake of argument say that the most complete science term dictionary only has 1/2 of the scientific terms and every single one of those science terms is Latin in origin. (A rather silly assumption but we will make it.)
That means there are 76,000 Latin terms used in science medicine etc. Those terms would not be in the OED so we add them to the words total of the OED.
That gives us roughly 676,000 words in the English language. Of that using our silly assumption 76,000 of them are scientific terms that you want to exclude.
76,000/676,000 = 11.2%
That means 88.8% of English words are not Latin scientific terms. We know that 29% of all English words are of French origin.
.29 /.888 = 32.6% .
So with a liberal assumption French makes up about 33% of the English language. Now can you put your stupid claim to rest and stop trying to pretend it is true?