Ya know, rc's talk about the eurcharist is about Jesus' presence. So lets go to Scripture and see what was said and done
Luke 22:14-20
When the hour came, Jesus and his apostles reclined at the table. 15 And he said to them, “I have eagerly desired to eat this Passover with you before I suffer. 16 For I tell you, I will not eat it again until it finds fulfillment in the kingdom of God.” After taking the cup, he gave thanks and said, “Take this and divide it among you. For I tell you I will not drink again from the fruit of the vine until the kingdom of God comes.”
And he took bread, gave thanks and broke it, and gave it to them, saying, “This is my body given for you; do this in remembrance of me.”
In the same way, after the supper he took the cup, saying, “This cup is the new covenant in my blood, which is poured out for you.
Nothing about....... "do this and I will be inside of you. Or do this and I will be in your presence" or "do this and you will be saved" rc's ignore verse 63 in john 6 in which Jesus corrected the disciples thinking.
John 6:63
The Spirit gives life; the flesh counts for nothing. The words I have spoken to you—they are full of the Spirit and life.
None of the apostles ever tell anyone to eat flesh and blood to receive salvation. They told people "believe upon the name of Jesus".