This reminds me of Theo Huxtable's little passionate speech in the first episode of Cosby. Instead of getting the then-required "Oh Son, I see how right you are!" he got "that is the DUMBEST thing I have ever heard!"
These people can certainly form and create any church they want. They can worship rutabaga leaves and dance naked in the moonlight. They just can't be Catholics.
Catholicism is not a democratic theology. You is or you ain't. You don't get to call the shots -- that is for protestants. You want to follow the teachings of the Church, then you follow them all. Otherwise, what is the point of being Catholic?
Was that where Bill laid down his famous quote (previously used even more effectively in Fatherhood):
"I brought you into this world, and I'll take you out!"?
:^D