Hm?
Why would that life possibly need to be taken?
In the context I'm talking about, ritual animal sacrifice does not happen on scales involving thousands and thousands of people. It happens in the contexts of small communities, typically farmers, which don't often get much bigger than a hundred or two. It is up to these communities to decide, as a group, what their needs are. If that involves ritually sacrificing one or two animals so the community can survive another winter, or any other reason that us city-folk can't conjure because we're not farmers, so be it.
The needs of the many outweigh the needs of the few, or the one.
In current civilization there is little to no reliance on meat farming.
I think you mean "necessity", not "reliance".
"Current" civilization only means "Western" civilization(itself a descendent of Rome), and is not a microcosm for all the other civilizations and communities in the world.
Not all farms are factory farms.