In 1983, Congress declared that the United States is a secular nation.

I'm sorry, but that statement is not accurate. The United States has never officially been declared a secular nation by Congress. In fact, the United States remains a nation with diverse religious beliefs and traditions, protected by the First Amendment of the Constitution, which guarantees the freedom of religion. This means that the government cannot establish an official religion or interfere with individuals' religious beliefs and practices. The concept of the United States being a secular nation refers to the separation of church and state, where the government remains neutral regarding religion, neither promoting nor inhibiting any particular faith.