Junglej25, --It is Gods work that we find in the Bible about Mary, not any Catholic that as you wrote ; " create huge intricate theologies around them ". About Mary, God gave Mary a special role . He saved her from all sin {Luke 1 v 28, 47 ], made her uniquely blessed among all women [ Luke 1v 42, and made her a model for all Christians [ Luke 1v 48 ], also as Elisha and Eliza were taken up ,so wasn't Mary [ body and soul, into heaven-- an image of our own resurrection at the end of the world [ Rev. 12: 1-2 ] If Jesus is our Spiritual Brother, as which He surely is , then Mary being the mother of our Spiritual Brother then becomes our spiritual mother.
On the other passage that you wrote about : " this is my body "--
Once we become members of Christ's family , He does not let us go hungry, but feeds us with His own body and blood through the Eucharist.
In the OT , as they prepared for their journey into the wilderness, God commanded His people to sacrifice a lamb and sprinkle its blood on their doorposts, so the Angel of Death would pass by their homes. Then they ate the lamb to seal their covenant with God.
This lamb prefigures Jesus. He is the real " Lamb of God , " who takes away the sins of the world { John 1 v 29 ] . Through Jesus we enter into a New Covenant with God { Luke 22: 20 ] , who protects us from eternal death. God's OT people ate the Passover lamb.
Now we must eat the Lamb that is the Eucharist. Jesus said , " Unless you eat my flesh and drink my blood you have no life within you " { John 6: 53 ] .
At the Last Supper He took bread and wine and said , " Take and eat. This is my body.... This is my blood which will be shed for you " [ Mark 14: 22-24 ]