Who Founded to keep the separation of church and state?

The principle of separation of church and state is often attributed to Thomas Jefferson, who famously referred to it as a "wall of separation" in his 1802 letter to the Danbury Baptists. This concept was further solidified by the First Amendment of the U.S. Constitution, which prohibits the establishment of religion by Congress. The founding fathers aimed to ensure religious freedom and prevent government interference in religious matters.