During the American War for Independance, the colonists broke down into roughly three equal components: one-third wanted independance from Britain; one-third wanted to remain loyal to Britain; and one third franky didn’t care one way or the other. This means that the faction which actually created the United States was realistically outnumbered two-to-one.
I suspect the worldwide Muslim population breaks down in a similar manner. You have one faction (admittedly perhaps quite small) that is radicalized and wants the complete and utter destruction and/or subjugation of the West; you have another (perhaps equally small) faction that denounces all forms of violence and terrorism; and then you have a third faction (which I personally think is hugely vast and contains the majority of Muslims worldwide) that takes no official position, but which wouldn’t lose too much sleep if the radicals triumphed. They say nothing, but secretly root for the terrorists and hope the terrorists win in their anti-Western jihad.
The actual numbers are speculation, of course, but if I had to take a wild guess, I’d say it probably break down to something like radicals=10%, moderates=20%, and the majority=70%. So, just as with the American colonists favoring independance, the moderates are outnumbered, except in this case it’s not three-to-one, it’s four-to-one.