That explains a small part of the scriptural evidence but by far not all of it. Why "this is by body" and "do it" then? Why John 6:51ff explaining the opposite? When I see evidence of addressing the material I suggest that you read, I might begin to take you and your co-religionists seriously. Not sooner.
Why “this is my body,” and “do this in remembrance of Me?”
It seems rather straightforward to me.
Jesus is instituting a new sacrament, at Passover, to fulfill and take the place of Passover.
At Passover, the Jews remember the Angel of Death “passing over” them as he saw the blood upon their door way.
Jesus Christ is our passover lamb, now “For even Christ our passover is sacrificed for us:” (1st Cor. 5:7) Behold, the lamb of God, who takes away the sins of the world! (John 1:29)
The angel of death will pass over those of us who are protected by the blood of our passover lamb - Jesus Christ. The sacrament of communion fulfills and takes over for the Passover Feast.
So He says, this is my body, this is my blood, do this in remembrance of Me. So we do.