Somebody already defined that one...
...your right to swing your fist ends at my nose.
Or, you have the right to do and say as you please, as long as you don't hurt anybody by doing it. As soon as you cross that line, you'd better have a darn good reason for doing so, or else you'll be held liable.
See also the "yell fire in a crouded theatre" argument.
We already have the basic framework in place - that can be applied. Freedom of religion IS protected, but threatening people, and then those threats being carried out, is not protected.
I just wish we'd apply that standard to some of our own fundamentalists...
