They told him if he was baptized he was welcomed to receive. He didn't know if he had been baptized, but decided to receive anyway. He said he took the bread, but the cup looked like the flu waiting to happen and he declined. Note that Christmas carols were this family's soul music. It is a mistake to assume that all church music resonates as effectively with visitors.
Soul music is often generational as generations are becoming culturally distinct.
What this story warns us is that we need to be prepared to answer the questions of a truly unchurched person who may be sitting next to us at the Eucharist. We no longer can assume that the visitors know what Christianity is about. There are generations out there that have not heard the gospel and dislike typical church music. God has been part of their lives. It is up to us to find out where and how.