> Congress shall make no law regarding an establishment of religion or the free exercise thereof.
True, but did the founders intend that there be the free exercise of cults and paganism? I think we have to draw the line somewhere, and witchcraft belongs on the other side of it.
They didn't make the distinction, so no constitutional basis exists for a distinction under the law. Cultural taboos kept such things limited to the underground for most of our existence as a nation. But, cultural taboos have been under attack, pretty much since the 1960's. Should've seen it coming then, some did but were branded kooks.
"... an amendment was proposed by inserting "Jesus Christ," so that it would read "A departure from the plan of Jesus Christ, the holy author of our religion;" the insertion was rejected by the great majority, in proof that they meant to comprehend, within the mantle of its protection, the Jew and the Gentile, the Christian and Mohammedan, the Hindoo and Infidel of every denomination." -- Thomas Jefferson in reference to the Virginia Act for Religious Freedom
In short, the answer is "yes."