My ancestors were Mennonites. They came from Switzerland to the colony of Pennsylvania specifically because William Penn declared that there would be no official state religion:
All men have a natural and indefeasible right to worship Almighty God according to the dictates of their own consciences; no man can of right be compelled to attend, erect, or support any place of worship, or to maintain any ministry against his consent; no human authority can, in any case whatever, control or interfere with the rights of conscience, and no preference shall ever be given by law to any religious establishment or modes of worship.
- William Penn, Declaration of Rights
When I hear those who cry "Religious Freedom!" in opposition to the recent Supreme Court ruling on marriage equality, my hackles rise, because they are not operating from the same understanding of what religious freedom is.