Here’s an example of what happened in my former (Baptist) church. I think this may be what you’re asking about. Note: I’m explaining this as I would have during my time as a Baptist, not as I believe today, necessarily.
On the first Sunday of the month, a plate of bread pellets and small “shot glasses” of grape juice were passed through the pews. The bread and juice had absolutely no significance of their own and were treated like common kitchen items before and after the service.
The significance was in two places:
- We were doing what Jesus told us to do. While doing so, we silently reflected on his sacrifice of the cross and its meaning for us - for us as a group, but mostly for us individually. The minister would offer a reflection or bible reading, prayer, and a song to follow. (With respect to the concept of the chosen people, all believers are considered the chosen.)
- We consumed the bread and juice in unison. If I were in the first pew, I held the bread in hand until everyone had a piece, and we ate at the same moment. In this sense, we are expressing our communion with one another in common belief.
It was entirely symbolic, but it still held a very important place in worship and was very meaningful for the Baptist way of thinking.