Neither can they be forced to accept the Christian way because that would violate liberty of conscience. Christians and non-Christians live under the same government. They all have the same rights, and liberty of conscience must be respected. Yet consciences can be educated and influenced. Christians, whose liberty of conscience is just as sacred as that of non-Christians, should be free to influence others toward the Christian worldview.
All societies have a standard.
Christians can raise their standard and use all legitimate educational and political means to promote that standard for their country. Non-Christians are free to do the same. Pluralism is a different concept altogether. The basis for modern pluralism is moral relativism. Those who advocate pluralism usually don't believe in absolute truth.