Well, Saint Paul, Saint Augustine (who taught their congregations "YOU are the body of Christ") and several other Fathers of the Church disagree with you.

Check out 1 Corinthians 12:27, for example.

Check out Augustine's Sermon 272 to the newly-initiated, for example.

What I do concede is that, as I said in my first reply to you, Lumen Gentium 8 has to be understood in terms of what is said in Lumen Gentium 1-7.