You miss the point. The Aztecs didn't sacrifice willing subjects, they sacrificed their enemies. In fact the reason why the other tribes joined the Spanish was that they were sick of the Aztecs killing them en masse.
So if I am exempt from laws that offend my religion, I should be totally able to sacrifice my boss to the Winged Serpent!
nope. Because they weren't suing Philips personally, they were suing Masterpiece Cakeshop, Ltd. A business entity. Businesses aren't people, my friend. (To paraphrase Mitt Romney).
Not relevant.
Except that there's no popular will to change the law.
Nope. There's no difference at all. The only difference is a religion has gotten to the point where it is established and respected. Koresh was molesting kids, but so was the Catholic Church, and I didn't see anyone storming St. Marks.
If you want to go by what the bible says, you need to stone any of your neighbors who work on Sunday.
Then he needs to go find something else to do for a living.