Agreed. And as Communion is a public confession that one's beliefs are in consonance with their brethren at the rail, a guy needs to be careful about his actions lest they are misconstrued and cause one of weaker faith to stumble.
Well when Paul was speaking of causing “weaker faiths to stumble” he was talking about some people’s preoccupation with superstition. There is no place for superstition, idolatry, magick, etc. in the Christian faith, let alone in communion with Christ.