Most likely the Eucharist was an invention of Paul after a dream he had. There is a Jewish ritual at passover that has aspects of it. There were also mystery cults that had the idea of eating your god. Paul believed that other gods existed so it's possible he had heard of these mystery cults practice and lumped it together with Jesus.

If the New Testament were written today the publishing company would be sued for copyright violations and critics would call it derivative. Not a single idea or event or word doesn't come from early sources, nothing is unique about it. Which to be fair, writing fiction isnt easy.

Apparently the Eucharist used to be psychedelic, which explains a bit

Christianity is a blood cult.

This is one of the cases where OP shows they don't really know what they're talking about. Drinking, singing and eating are like 75% of the holidays. Though, if we're supposed to take "Don't drink to much" as "Don't make me drive you to the hospital", then maybe it works.

Heck, Pesach has a 4 drink minimum! Every Friday we start Shabbos by drinking one glass of wine. There's Kiddush clubs in NYC where (mostly hassidim) gather to do Kiddush... then do it again and maybe again. It's wise stuff to celebrate the work week being over with a glass of wine.

Also, Purim rules. You get dressed up in costumes, eat cookies and get wicked drunk. Fun time.