A. The Lord's Supper is an ordinance of the New Testament, instituted by Jesus Christ; wherein, by giving and receiving bread and wine, according to his appointment, his death is shown forth (1 Cor. 11:23-26), and the worthy receivers are, not after a corporeal and carnal manner, but by faith, made partakers of his body and blood, with all his benefits, to their spiritual nourishment, and growth in grace (1 Cor. 10:16).
136 LG 11.
137 PO 5.
Protestants like to keep things simple. And, unlike Catholic catechisms, one can easily look up the reference on the Protestant catechism to see if they're being sold snake oil. Sure, Protestants can argue whether we should serve only wine or whether grape juice is permissible, but it doesn't change the purpose of the Lord's Supper nor the text which supports the meaning of it. This is not true of the Catholic catechism for which there is no context and vague references. I remember trying to look up the references of several Catholic catechisms only to give up.
Please keep in mind that most Protestants do not understand their catechism just like most Catholics don't understand theirs. Therein often lies the confusion.
I don’t agree with your statement there’s not much difference in interpretation.
There’s a great deal of difference between salvation by election and salvation by grace through faith. There’s quite a difference between real presence in Holy Eucarist and not.
And you also have Unitarians and Oneness Pentecostals who claim the doctrine of sola scriptura.