The Bible alone never says the bread or wine changes. That's Catholic. I don't believe the Catholic Church is the Church of the New Testament. I believe they persucuted true believers and I don't believe the traditions of the Catholic Church. I don't believe you have the traditions of the New Testament Church. If you use the Bible alone you will see that it never says that the bread or wine changes into his body or blood. Jesus was being symbolic.
Nowhere does He say that it is a symbol. And we see recorded in the Scriptures the reactions of His followers when told that they needed to eat His Flesh and drink His Blood. They reacted in shock, disbelief, and disgust. Certainly seems they understood Him to be literal.
And it's not just us Catholics who believe that. Indeed, the belief that the bread and wine become Our Lord's Body and Blood is found within writings from Christian believers in the first century. The Oriental Orthodox, the Eastern Orthodox, and even a good number of Anglicans hold to this belief as well. The idea that it's symbolic is a new belief that is not found in the ancient Church. The earliest records we have from our forefathers in the Christian faith following the times of the Apostles holds to this viewpoint.