The survey of 3,000 adults from Aug. 1-18 was conducted for the Pew Research Center and the Pew Forum on Religion and Public Life.
The number of Americans who say Islam has little or nothing in common with their own religion has spiked to 70 percent in the past two years from 59 percent, the poll found.
Another significant shift has taken place: In 2005, 36 percent of the public said Islam is more likely than other faiths to encourage violence among its believers. That number has risen to 45 percent.
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