So then, if Indiana has a true Religious Freedom Restoration Act, then Mormons can engage in plural marriage and Rastafarians can smoke weed with impunity.
Right?
Wrong.
Trivia question: Why was the 1994 RFRA passed in the first place? (Hint: Peyote)
What we have here is a possible violation of the Establishment Clause, since it elevates a religion above all others by giving them impunity against possible legal action stemming from his refusal to serve gay couples, yet atheists who simply don't like gays and refuse to serve them enjoy no similar protection under the law. So the law creates an inequity.
That is a good point, and I maintain if Atheism were properly understood to be a belief system, IOW a "religion," then the gays are the ones violating the law like mad.