Not to dissuade other knowledgeable comments, but I gave an answer to that here. As an addendum to address the last part, it would not have been possible for the Catholic church or other Christian denominations to forego the use of wine altogether because they believe wine is necessary for the sacrament. Some Christians are okay with substituting grape juice (such as Thomas Welch, founder of Welch's Grape Juice), but others regard that as strictly impermissible.