Hard to make sense of that survey, I just don’t believe there an be that many “undecideds,” but Trump probably needs to re-check his stats.
I saw another Pew Poll, that specifically gave more numbers on the US. You can get to it from the first poll. The 27% is there for several countries and several continents, but specifically for the US it ranges from 11% to 23% on a variety of issues. The numbers however are 63,000 reviewed not 600, so in that regard he is correct. He said If I remember correctly or I think I read, so, they can crucify him on the exact numbers, but the numbers in the Poll are much, much, higher than they reported.
The real threat is not a rampaging ISIS in Nottingham, Camels crossing the Alps, or an Islamic Red Dawn. The threat is that the "moderates" don't consider it extreme to undermine and replace other existing religious and social structures with islam.