1. Anyone can freely criticize Christianity, Judaism, Buddhism, Hinduism, Scientology, Jainism, atheism, and every other "ism" on the planet, but not Islam.
2. People who criticize Islam (like Geert Wilders, Salman Rushdie, Ayaan Hirsi Ali, etc.) need bodyguards for the rest of their lives. People who criticize Jesus or Joseph Smith or Krishna or any other religion or political ideology don't need bodyguards.
3. And Islam is the only religion trying to assure everyone else that they are a religion of peace. You don't see the Amish trying to convince anybody how peaceful they are.
I think it's possible that these simple facts, stated plainly and matter-of-factly, at an appropriate time in the conversation, would sink in and do their magic. And one morning, your listener will wake up and declare, "Islam isn't really a religion of peace!"
And we'll have one less dhimmi in the world. One less person who unwittingly aids the enemy. One more ally when ALAC laws are being voted on or immigration policies are being changed. One more person who will support a politician willing to speak honestly about Islam.