oh, and by the way, almost every states bans harming an animal for reasons other than medical science or consumption.
so animal sacrifice IS illegal in most if not all of the USA.
oh look, injuring & killing of animals for ANY reason other than food consumption or medical research/science, is 100% illegal in the State of New York, with NO religious exemptions:
§ 353-a. Aggravated cruelty to animals
1. A person is guilty of aggravated cruelty to animals when, with no justifiable purpose, he or she intentionally kills or intentionally causes serious physical injury to a companion animal with aggravated cruelty. For purposes of this section, "aggravated cruelty" shall mean conduct which: (i) is intended to cause extreme physical pain; or (ii) is done or carried out in an especially depraved or sadistic manner.
2. Nothing contained in this section shall be construed to prohibit or interfere in any way with anyone lawfully engaged in hunting, trapping, or fishing, as provided in article eleven of the environmental conservation law, the dispatch of rabid or diseased animals, as provided in article twenty-one of the public health law, or the dispatch of animals posing a threat to human safety or other animals, where such action is otherwise legally authorized, or any properly conducted scientific tests, experiments, or investigations involving the use of living animals, performed or conducted in laboratories or institutions approved for such purposes by the commissioner of health pursuant to section three hundred fifty-three of this article.
3. Aggravated cruelty to animals is a felony. A defendant convicted of this offense shall be sentenced pursuant to paragraph (b) of subdivision one of section 55.10 of the penal law provided, however, that any term of imprisonment imposed for violation of this section shall be a definite sentence, which may not exceed two years.
I have little doubt that every other state in the USA has a similar law.
..oh look, California also makes it a crime to kill or abuse animals, and mentions no religious exemptions:
CAL. PENAL CODE § 597 (2010). Cruelty to animals.
(a) Except as provided in subdivision (c) of this section or Section 599c, every person who
maliciously and intentionally maims, mutilates, tortures, or wounds a living animal, or
maliciously and intentionally kills an animal, is guilty of an offense punishable by imprisonment
in the state prison, or by a fine of not more than twenty thousand dollars ($20,000), or by both
the fine and imprisonment, or, alternatively, by imprisonment in a county jail for not more than
one year, or by a fine of not more than twenty thousand dollars ($20,000), or by both the fine and
imprisonment.
...oh, and did I mention its a Federal offense to harrass, mame, or kill an animal protected by the Endangered Species Act?
