It would look like something that the USSC could knock down, even if not repealed.
A cornerstone US constitutional philosophy is that, generally, good speech may be expected to vanquish bad speech — with some tightly constrained exceptions such as libel and slander. It was early held in the courts that sedition didn’t qualify — it could be countered by patriotic messages. Raising up the devil never has as much power as raising up God. However this principle is sorely tested when few people are truly interested in raising up God.
Like it or not, America has a theological background. Its constitution, while not perfectly formulated, was intended to stand against such a background. Good is stronger than evil, and speech is a means of raising the power of either.