The "wall of separation between church and state" was described by then-president Thomas Jefferson in 1802 in support of *Baptists*!
The Danbury Baptist Association wrote to Jefferson, seeking explicit protection of religious liberty, and against a government establishment of religion. Jefferson responded, saying, "Believing with you that religion is a matter which lies solely between Man & his God, that he owes account to none other for his faith or his worship, that the legitimate powers of government reach actions only, and not opinions, I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should 'make no law respecting an establishment of religion, or prohibiting the free exercise thereof,' thus building a wall of separation between Church and State."
What about the Father of the Constitution and the man who wrote the Bill of Rights? James Madison wrote of the "practical distinction between Religion and Civil Government as essential to the purity of both, and as guaranteed by the Constitution of the United States". Madison drafted legislation that disestablished the Church of England in Virginia, thwarted Patrick Henry's plan to compel citizens to pay taxes that would go to churches, and worked with Baptists on constitutional guarantees for religious liberty in Virginia.
Remind religious people that separation of Church and State was their idea. It protects us all.