I'm not the kind of skeptic atheist who constantly and aggressively attacks religion, particularly Christianity, just for the sake of it. I like to consider myself more reasonable, academic and rational than that. And that means being able to analyze religion, such as Christianity, on its own terms, from its own perspective. Even if I don't believe it, I still consider myself capable of understanding its beliefs and tenets, and kind of putting myself in the shoes of a serious educated Christian, and examine the religion from a Christian perspective. It's the same kind of thing as approaching the Bible seriously and academically as a work of historic literature and a source of human history and culture, even if you don't believe any of the supernatural (nor most of the historical) claims made in it.
In this case I would like to momentarily put my "Christian hat" on, and examine one of the most fundamental tenets of Christianity, and that would be the sacrament of the Eucharist, ie. Holy Communion.
There are literally tens of thousands of denominations of Christianity with wildly different interpretations of their religion, but one thing that the vast majority of them (with perhaps only the exception of a few extremely small and fringe cults) agree with are the two most fundamental sacraments: Baptism and Eucharist. Some denominations believe in more sacraments (for example Catholicism has seven), but most of them agree at least on these two. They could be considered the two most important and fundamental sacraments of Christianity as a whole, spanning the vast majority of denominations.
Of course that doesn't mean that all denominations believe the same things about the sacraments themselves.
More particularly, Catholicism believes something about the Eucharist that the vast majority of other denominations do not. Particularly, the Catholic catechism believes in the doctrine of "transubstantiation", which means that when the priest blesses the bread and wine used in the Holy Communion, they become literally the body and blood of Christ. Not figuratively, not symbolically, but literally.
(This does not mean, even according to Catholic doctrine, that the physical matter, the atoms and molecules, that the bread and wine consists of changes. The molecular structure remains the same, the composition remains the same, the taste and physical properties remain the same, but the nature of the bread and the wine is literally changed at a metaphysical level. Again, not figuratively or symbolically, but literally. One could say that the bread and the wine become the body and blood of Christ by definition, in the literal sense. In the eyes of God, and by God's divine intervention, the bread and wine are the literal physical body and blood of Christ, even if the molecules themselves don't change.)
Most other denominations, even the major ones, do not agree with this. Their interpretation is that Jesus was being metaphorical, and that the bread and wine are considered his body and blood in the symbolic sense, not the literal sense. (In the same way that Jesus being "the Lamb of God" is a metaphor and does not mean that Jesus was a literal sheep, the bread and wine are metaphorically, not literally, his body and blood.) In God's eyes it's the symbolic gesture that matters.
Even then, most denominations still consider the Eucharist a sacred event, a sacred act to be performed and approached with the utmost respect, one of the holiest rituals that Christians engage in, an act established and commanded by God's Son himself, as an act of grace and remembrance.
Some denominations, in fact, consider it so holy and sacred that their members only participate in it once, just like is the case with baptism. Indeed, in the same way as baptism is a one-time event symbolizing the person being "reborn" into Christianity, the Holy Communion is considered a similar one-time event, an act of unification with Jesus, the Savior.
Other denominations do not restrict it to be a one-time event, but still consider it so sacred and holy that it's restricted to the major holidays, sometimes even just once a year (obviously to the Passover, which is when Jesus himself established it.) A common doctrine in these denominations is that doing it too often trivializes the act, makes it more mundane and common, and mars its sacred holy quality.
Yet, other denominations, even major ones (including Catholicism) do not have such restrictions and very typically organize Holy Communion at least weekly (usually on Sundays, or Saturdays in the case of some of them), sometimes even more than once a week.
The Bible itself does not mention any restrictions, not even in passing, so in that sense this is not directly forbidden. However, from a Christian perspective one cannot help but to consider that those denominations have a point who posit that organizing it too often devalues it and makes it more mundane and trivial, even though it's supposed to be one of the most sacred and holiest acts of all of Christianity, a sacrament that should be approached with utmost respect and veneration, not something trivial done weekly or even more often.
Then we have some certain fundamentalist Christian denominations, especially some of those most prevalent in the United States.
In the same way as the vast majority of denominations agree on the two sacraments, most of them also agree that the drink used during the Eucharist should be wine, because that's what Jesus used. The bread should be actual bread, not something else, and the wine should be wine, not something else.
Not these certain fundamentalist Christian denominations. You see, some of them teach that alcohol is one of the greatest sins in existence, and preach 100% absolutism. Not a single drop of alcohol, ever, under any circumstance. They have an absolute hard-core stance on this, in the same way as they have towards extramarital sex: Absolutely no alcohol, ever, period, end of discussion. Alcohol is evil and Christians must avoid it like the plague.
There are a few Christian denominations that have similar attitudes towards alcohol, but make an exception with the Eucharist (usually the only exception they make). Not these certain fundamentalist denominations, though. To them, even the Eucharist is not an exception: No alcohol ever, period!
So they substitute it with non-alcoholic grape juice. In fact, most of these denominations outright teach that Jesus himself used non-fermented grape juice during the Last Supper (and anywhere else in the Bible where "wine" is mentioned as being used by believers). They claim that the word used for "wine" in the Bible means non-alcoholic grape juice. All biblical scholars, experts on the languages and culture of the time, and Jewish scholars and rabbis disagree on this, but these fundamentalist denominations don't care. They ignore all that disagreement and assert that their interpretation is the only correct one.
Moreover, and most egregiously, their entire approach to Holy Communion is the exact opposite to those denominations who restrict it to just once a year (or even once per lifetime): In many of these denominations the Eucharist is exactly what those other denominations don't want it to be: It's trivial, it's common, it's mostly performative, it's approached extremely lightly, often several times a week. To them it's like just a small quick prayer or blessing a meal. Something to be done routinely and casually, without much thought or veneration.
In fact, and I kid you not, there are some denominations in the United States where the entire Eucharist has been literally industrialized. I'm not exaggerating. This is a real product that's industrially produced and sold there:
What is it? I'm not even making it up: It's an industrially produced plastic cup with a lid that contains a bit of grape juice and a piece of bread under the lid. This is literally something that some of those American fundamentalist Christian denominations are using for the Eucharist. You open the lid, eat the small piece of bread, and drink the grape juice. That's your "Holy Communion".
There are ex-members who consider this a complete mockery of the holy sacrament, even to the point of being sacrilegious. And it's hard to disagree with them, even from a secular academic perspective.
If we keep our "Christian hat" on for a bit longer, it does indeed feel like completely ridiculous. One of the most important, most sacred, holiest, most important rituals of the entire religion, reduced to an industrialized product, fabricated in some factory somewhere and sold as a commercial product, to be casually consumed at a moment's notice.
One would think that if fundamentalist Christians truly believe in their Holy Scriptures and their teachings, they would not denigrate one of their holiest rituals, established by Jesus himself, like this. It's a complete travesty.
