"Those who believe in Islam are not likely to be extremists any more than Catholics are likely to be *****philes…those who belong to the far right are."

So that's about 50% then 😀

But I believe your analogy is flawed. You are comparing entire religions on the one hand with a minority element of a political preference (eg "conservative").

If you wish to say members of the far right are terrorists you should compare to members of Isis being terrorists.