What law protected catholics from any attempt o make Maryland a protestant colony?

The law that protected Catholics in Maryland from attempts to turn the colony into a Protestant stronghold was the Maryland Toleration Act of 1649. This act granted religious freedom to all Christians, specifically protecting the rights of Catholics to practice their faith without persecution. It was a significant early step towards religious tolerance in the American colonies, though it primarily benefited Christians and did not extend to non-Christian religions. The act was eventually repealed in the late 17th century, leading to increased persecution of Catholics in Maryland.