The Delaware Colony did not have one specific religion, which then opened it up to religious freedom for Quakers, Catholics, Jews and more. The Charter of Delaware specifically stated that there was no one religion to subscribe to, but instead offered its residents a chance to explore their options.
Although the charter allowed citizens to practice their desired religion, it did have a section which stated that only those people who believed in Jesus Christ would be able to serve in the government. It was clear to include verbiage that still allowed them to pursue other religious freedoms as well. But, the deciding factor was whether or not they believed Jesus Christ was the savior of the world.