Religious exemptions are a good thing and should be respected. It’s important to be skeptical of novel religious claims, as they're usually just a cynical abuse of a legal exemption. Exemptions should certainly not be limitless: America is incompatible with human sacrifice.
I think we make selective religious accommodations and exemptions for no good reason. Why is one person’s fiction more deserving or more valid than another? Followers of CotFSM and Scientology have as much of a claim on special treatment as do older religions.