The religion of the Aztec civilization which flourished in ancient Mesoamerica (1345-1521 CE) has gained an infamous reputation for bloodthirsty human sacrifice with lurid tales of the beating heart being ripped from the still-conscious victim, decapitation, skinning and dismemberment. All of these things did happen but it is important to remember that for the Aztecs the act of sacrifice - of which human sacrifice was only a part - was a strictly ritualised process which gave the highest possible honour to the gods and was regarded as a necessity to ensure mankind's continued prosperity.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Aztec_Sacrifice/.