I would say no in answer to the question. License plates are issued by individual states not by the federal government or specifically Congress. Here is what the first amendment says:
Quote:
Amendment I
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.
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Ironically, if Congress passed a law prevent religious license plates someone could argue that as a violation of the first amendment.