If a man like Malcolm X could change and repudiate racism, if I myself and other former Muslims can change, if young whites can change, then there is hope for America.

This quote is suggesting that American society can become more open and accepting of people who are different. It is saying that no-one is stuck in their beliefs and behaviours, and that change is possible. It cites examples of people such as Malcolm X, former Muslims, and young whites to suggest that it can happen. This implies that there is still hope for America to build a more tolerance and accepting society.