To stop government from supporting one religion
Explanation:
The purpose of the establishment clause is to guarantee the country's religious freedom.
Religious freedom is provided in the First Amendment to the Constitution of the United States, which provides that "Congress can not make any law with the establishment of a religion, or with the prohibition of its free exercise." In this way, it can be affirmed that the so-called "Establishment Clause" is extracted from the American constitutional text, which prohibits the State from establishing an official religion, as well as establishing in the United States a rigid separation between the State and Church, which is characteristic of the lay state.