The right to religious freedom is a fundamental human right. That means it can only be restricted because of a clash with another fundamental right, for example related to the life or freedom of others. The state has the power to decide which rights take precedence. In most situations, a Christian should be free to wear a small cross around their neck, or a Muslim to wear a headscarf. If they do not endanger themselves or others, why would the state have the right to limit them in their fundamental right to freely choose and exercise their religion?
Love for your country is great, but if nationalism means that you exclude others or restrict their fundamental freedoms then this is wrong. Following your conscience you can support anyone anywhere – as long as you do so in line with the teachings of Jesus.