The question of how people orient around religion differently, or interact with one another, whether that be based on conflict or cooperation, will be one of the most engaging questions of the 21st century.
To teach your child to only be a Muslim in Muslim spaces or only a Christian in Christian spaces means in a way that you're teaching them a religious identity that is relevant to only a very small part of their lives, because the vast majority of their lives in the 21st century are going to be lived in interaction with others.
Have big dreams but focus only on what you can control: your own thoughts, words and actions. This was Gandhi's way ... in the words of Buddhist poet Gary Snyder, our job is to move the world a millionth of an inch.