1. You are against racism, and if people understood more about Islam, it would prevent racism.
2. You are not criticizing Muslims, you are criticizing the political and religious doctrine of Islam.
3. Until your listener has read the Koran for herself, she really doesn't know what's going on. And if you have read the Koran, make it a point to mention that relevant fact.
Work these into the early part of your conversation and you will have a much more willing listener. Listen to me: Multiculturalists are the people we most need to reach. Please do not write them off. These are the people we are not reaching, and there are millions of them. They could be our allies, but their wall must be penetrated. Hammer those three points adamantly up front, and you may well find yourself with an open mind to talk to.