Food sacrificed to idols

We read that we should not ask whether food has been sacrifice to idol before eating it, etc. but how many of the religions these days still actually sacrifice to idles?

I only know of Hindus who actively still do it.

Then there are the Muslim rituals around Halal foods, but I wonder about that one as you don't have an actual priest doing a sacrifice like the Hindus do. It is now more a social guideline that companies have to follow (and pay for the opportunity to participate) and an Imam will go there once in a very long while to do a prayer over the building.

Hmmm, does that still constitute as idol worship or is that just a way of making money and keeping people in check?

So, which other religions do you know of that actively have priests doing sacrifices? Should it therefore be a huge issues to constantly look out for as in the days when the Bible was penned?