In fact, it's mush closer to 80 % than to 50 %.
And 1/2 of the Koran it's about the Jewish prophets.
At this point I don't think that you are a real muslim. I think you are pulling our leg. No one in their right mind thinks that 50-80 of Jews convert to islam. Even real muslims don't believe that nonsense. What you are saying is just as insane as saying 50-80 percent of doctors now think that cancer is good for you.
I'm thinking you are a troll. You are making some outrageous assumptions and I think it's for attention.
Furthermore, no REAL Jew would ever convert to islam. Why would you want to leave the truth for the insane koran?