Deism is the world view that God created the universe but doesn't interact with it anymore. Unfortunately most deists are smug assholes and filled with the same kind of intolerance as atheist nuts. Contrary to the other definition here it's possible to be a deist and not be opposed to religion. It's also possible to be both a Christian, following the teachings of Christ and be a deist by believing that God either never did interact or stopped interacting.
Deism is the worldview that God created everything but doesn't interact with us.