Like many in the world, Daniel Shayesteh closely watched this week’s U.S. visit of Iranian President Mahmoud Ahmadinejad.But his is a different vantage point.Three decades ago, the Iranian-born Shayesteh, 53, joined forces with those supporting Ayatollah Ruhollah Khomeni to topple the Shah of Iran and install Islamic rule.“Generally speaking, my background is radical Islam,” he says.No more. After fleeing Iran because of a falling-out with the religious regime, Shayesteh says he underwent a conversion to Christianity.He now travels internationally to raise awareness about what he calls “the dangers of Islam,” and he puts Ahmadinejad squarely in that category.“He is just...