Bread and Wine
Protestants maintain that Jesus Christ is the Son of God and that He left us bread and wine by which to remember Him. Catholics maintain that Jesus Christ is the Son of God and that He left us Himself under the species of bread and wine. Which one sounds like 'Holy Communion'? Why come all that way, from Heaven to Earth, only to leave us that which He had already given us in the first place? God, as understood by Catholic belief, loves us so much He wants to unite Himself to us, Body, Soul, Humanity and Divinity. God, as understood by Protestant belief, just wants to leave us alone as we remember Him.