Yes, I would like to comment. But there just isn't enough time left in this world to post all my comments. BTW: A "state of grace"? Yet another comment waiting.
To the same degree and for the same reason I believe He arose from the dead. Both equally hard to believe for non-Christians.
BTW - "Turned into" is a pretty crude and primitive way to describe transubstantiation, but I got your drift. The substance of the bread becomes the substance of the body of Christ.
If you had the ability to travel back in time to the Galilee in 33AD with every scientific and forensic tool available and encounter Christ you would not be able to prove that he was both man and God. Similarly, if you examine the Eucharist with every scientific and forensic tool available today you could not establish that its substance was too both bread and the body of Christ. It makes it no less so.