My argument all along has been that the purpose of the First Amendment is to protect the free exercise of the Christian religion.

One evidence that [the Founding Fathers] were not dealing ... they weren't even intending to deal with non-Christian religions is what they did with Mormonism in the latter part of the nineteenth century. Mormonism - they call themselves by the name of Christ, but it is not an orthodox Christian network of churches, it just is not. Mormonism is not an orthodox Christian faith. It just is not. They have a different Gospel, they have a completely different definition of who Christ is and so forth, I mean, the list could be multiplied endlessly.

And it was very clear that the Founding Fathers did not intend to preserve automatically religious liberty for non-Christian faiths, so when Mormonism came along, they practiced polygamy, they believed in polygamy, just like Muslims do today.