Matthew 26:26-28 Now as they were eating, Jesus took bread, and after blessing it broke it and gave it to the disciples, and said, “Take, eat; this is my body.” And he took a cup, and when he had given thanks he gave it to them, saying, “Drink of it, all of you, for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.
I see two things. First, Jesus is changing the Passover meal to declare the New Covenant, which is established by his atoning sacrifice.
Second, I
see that his atoning sacrifice is "for many" for the forgiveness of sins. Notice, Jesus didn't say "for all." Limited atonement right there. Thanks for bringing this to our attention.
Finally, Jesus did not slice up his actual body, nor did he cut open a vein to draw blood. Like the Passover meal, Jesus is establishing a memorial for us to remember his sacrifice. He wasn't saying that he was perpetually being sacrificed and his chosen needed to constantly recharge their salvation by eating his flesh and drinking his blood. The disciples knew this as Jews, yet you take it literally despite the obvious symbolism being presented.