We do believe what Jesus said. Why don't Catholics? Jesus said His words were spirit that the flesh profits nothing.
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.
Jesus would have been sinning by encouraging Jews to eat blood. Did the Jesus you believe in sin?
Your flesh is nothing. You are taking one sentence and igoring everything else that Jesus says here.
What are you so afraid of?
We Catholics take Jesus literally. Protestants don’t yet they say they believe in the Bible.
But really you believe in only part of it.