The Ramban calls Sefer Vayikra “Torat Kohanim.” The Sefer primarily deals with Korbanot (offerings) and maintaining the sanctity of the Mishkan. Parshat Vayikra deals with Korbanot. “Speak to the Children of Israel and say to them: When a man among you brings an offering to Hashem: from animals-from the cattle or the flock shall you bring your offering”(1:2). The Rambam records about 100 of the 613 Mitzvot pertaining exclusively to Korbanot. Many others relate to the Temple and the Temple Services.
Korbanot are mistakenly translated “sacrifices” (I may use this translation on occasion as well to drive home a point) when in essence they are “Offerings” to G-d which bring Man closer, more attached and better connected with the Almighty (the root of the word is “Karov” to bring closer).
In the Rambam’s Moreh Nevuchim (Guide to the Perplexed) 3:32, he claims that Korbanot were originally instituted because Human Nature is such that people cannot instantaneously abandon existing religious practices which the Jews were subjected to in Egypt. The Rambam maintains that the Egyptian idolaters used animal sacrifices in their worship. The Jews were re-directed to use this method of worship towards G-d, Almighty. The Ramban takes issue with the Rambam. READ MORE
that’s about as false as I heard .OT clearly has animal sacrifice order by God .