{To a question asked about communion as defined by different churches:]
The difference is doctrinal. Protestants who follow the Bible understand that the Lord Jesus is the 'one Mediator between God and men' (1 Timothy 2.5), while the Roman Catholic church will regularly add Mary and the saints, as they are known. Protestants who follow the Bible (not all do) understand that at the Cross 'Christ was once offered to bear the sins of many'; 'by one offering He has perfected for ever, those that are sanctified' (Hebrews chapters 9 and 10).
Sometimes on the surface, meetings and ceremonies in different churches might seem similar. But it's what is understood by them in terms of truth and doctrine which distinguish them at a deeper level.
The difference is doctrinal. Protestants who follow the Bible understand that the Lord Jesus is the 'one Mediator between God and men' (1 Timothy 2.5), while the Roman Catholic church will regularly add Mary and the saints, as they are known. Protestants who follow the Bible (not all do) understand that at the Cross 'Christ was once offered to bear the sins of many'; 'by one offering He has perfected for ever, those that are sanctified' (Hebrews chapters 9 and 10).
Sometimes on the surface, meetings and ceremonies in different churches might seem similar. But it's what is understood by them in terms of truth and doctrine which distinguish them at a deeper level.