The first amendment says, "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."
It says 'Congress shall make no law respecting an establishment of religion' in the first line, so, since congress can not make laws making us have a certain religion, we have the freedom to choose our religion.
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Often, root words are used in the making of new words. The word created from it will have meanings related to its root word, which allows one to get an idea of what the unfamiliar word could mean.