They are not. Quite a few have Latin roots and the like that corresponding French words share.

Approximately 0.0% of those came into English through Latin, while around 100% came through Norman French.

Latin was commonly spoken amongst the educated at one time (served as a lingua franca across Europe) and used for religion and scientific discourse for even longer.

That depends on when and how they entered English. A lot of scientific vocab was taken directly from Latin and Greek.