Why is the Establishment Clause so important and a part of the constitution?

The First Amendment's Establishment Clause prohibits the government from making any law “respecting an establishment of religion.” This clause not only forbids the government from establishing an official religion, but also prohibits government actions that unduly favor one religion over another.

The establishment clause sets up a line of demarcation between the functions and operations of the institutions of religion and government in our society.

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