Okay, if I must. So the basic mantra goes that Jesus died for our sins... basically set up as a divine human sacrifice. Okay, so why was that necessary? Is God making the rules, or is He following some unknown set of rules? Why is it necessary?
I don't think I need to explain why murdering people or tricking others into murdering people is bad. Being crucified is bad... that pretty naturally seems to suggest that knowingly causing someone to be crucified is bad.
Well, it's suggested that it was somehow necessary... which doesn't match up with the supposed power of this supposed God who created everything to begin with. That means that we're dealing with an evil God if he demanded an evil act without an appropriate justification that was clearly out of his hands.
And yes, it very much is right in line with the standard human sacrifice model -- to sacrifice other humans to the Gods to appease them so they don't do bad things to us. Jews practiced animal sacrifice in those days, so it's not particularly surprising. That's not anywhere close to an ethical system in my view of things. It's certainly not something anyone would consider today... any group practicing it today would likely be systematically wiped out with no one feeling sorry about it. A typical Christian zealot in today's world would consider it Satanic.
And yet...
That's what your core story is actually about. It very clearly points to a story which is fundamentally an act of human sacrifice committed by God himself on his own son in order to make a contract. Sure, it's sort of backwards, but it clearly points to human sacrifice.
...and on top of that we've got the ritual cannibalism of communion. Sure, it's not actually flesh and blood (unless you're a Catholic who believes it's magically transformed), but it still unquestionably pays homage to cannibalism.
Sorry, but I don't think crucifying people or eating them are things I want to celebrate in a religion. Those things are unequivocally bad. It's admittedly somewhat harmless in the way it's practiced, but that doesn't change the underlying ideas. Yes, early humans got into some rather messed up things (including slavery... and I haven't even got into that part). But we don't condone those sorts of things now (at least... most don't).