The difference is that if it isn’t, (which seems very likely to me) I want to ‘get over it’ and hopefully learn to think in terms of what is true (even if that turns out to be of no comfort).
An excellent book on this is by Paul Tillich (not Catholic) called My Search for Absolutes. You can skip chapter 1 and go straight to chapters 2-4 if you want.
As an electrical engineer, I think in terms of noisy and nonlinear communication systems. We receive signals which have been sent through a distorted system, and then try to ascertain what the original message was before the distortion.
We presume there is this totally objective thing called “truth” at some level, but the only knowledge we have of this truth has been in our thoughts and imagination, and/or has come to us through our senses. All of these things can fool us. Technically, we could all be in the Matrix. (For those who didn’t see the movie, it’s a construct in which humans are grown in pods but their brains are connected to computers so they think they are really living life in a city.)
That is why I can never intellectually claim that I know practically anything beyond any doubt at all. As a former algebra teacher, I have showed my class the trick where 1=2; the math looks totally correct until you realilze it is misapplied because it requires an implicit division by zero. I always keep a small amount of uncertainty. Without that uncertainty, I wouldn’t need any faith because I would simply “know” the truth.
How would you respond to the charge that you aren’t being honest about your faith?
I might ask the person to help me understand what they see wrong about me so that if I also object to it, I may work on improving myself. I love criticism, because every time somebody cuts me down, even if it’s 99% false, there is usually an element of truth that I can take to heart and use to become happier.
Aren’t you implicitly affirming that you believe the central doctrines of Catholicism when you take communion?