You don't get to decide that Wicca isn't a "real" religion for the purposes of the government.
If you don't like it, don't follow it. But you don't get to decide for the state.
That is exactly the point of the ACLU suit. They seek to "establish" the wiccanism of Gardiner as legitimate. In essence to USE the 1st amendment to have government establish a religion.
That alone is enough to stop the game playing.
After a millenium or two they are free to reapply if they have established themselves like legitimate religion.