Paul told the Corinthians that “as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes” (1 Corinthians 11:26). How so?
Among other effects, the Lord’s table is evangelistic, not to those who eat and drink but through them. The bread and cup don’t save, but someone might be drawn to the gospel by watching others celebrate it.
This meal that portrays us eating Christ’s body and drinking His blood makes absolutely no sense to the natural man. Without faith it’s disagreeable, disgusting, and detestable. What God would require mock cannibalism as worship? Well, our God does, the Father God who gave His only Son. The scandal of this table begs why the death? What could make that death a cause for feasting? Because the death came from love; the Son died because we deserved death. We believe this so much that we put our faith where our mouth is.
In addition, the world is represented around the table. If you’re an unbeliever, you might say, “I know that guy. How could that person be allowed to eat?” Or maybe, “How could those people possibly have anything to share, any reason for communion?” The answer is God’s love. Our eating is evangelistic because if it makes you ask why that person, it may also make you ask, “Why not me?” Our drinking is evangelistic because if it makes you ask what those people have in common, it may also make you ask, “How can I get in on that?”
If you don’t believe in Christ then don’t participate. You have no business celebrating another’s death when you have your own judgment coming. But if you don’t believe, you’re more than welcome to watch. There may be reason for you not to eat, but there is no reason for you not to believe.
For us who do believe, we ought to be making the world crazy with wonder about God’s love as we proclaim His death until He comes.