Sorry for butting in here, but the conversation went along a different path while I was away
I agree with much of what you’re saying here but must ask, How do you interpret Matt 16:18?
I would say that this means that the Church will never be destroyed nor will its mission of revealing Christ and mission to the world ever be compromised. On some issues, I believe the Church must teach truthfully or else the Church’s mission would be compromised. On other issues… not so much. This is the vague, protestant notion of essential and unessential beliefs. Let us take the doctrine of the Assumption of Mary. Can we really say that the Assumption of Mary is dogmatic for the gospel of Christ on the same level that the Resurrection is? I would think not, so I really cannot say that the Church must believe this doctrine or else its mission would be compromised.
Actually, it had to do with reforming the practice of almsgiving, as they relate to indulgences. Here is a good resource for you:
Myths About Indulgences.
Ah… Thank you for the correction. I actually knew this already, but I was just using the shorthand to which I am accustomed. I will change this in the future to avoid perpetuating misunderstanding.
The practice of offering indulgences in return for alms giving was never Church doctrine. If praxis is the greatest judge of doctrine, it’s nonsensical to claim that “even the best doctrines can have a corrupt practice.” This is double-speak to an absurd degree.

I really need to leave my computer for an hour or so and come back and read these posts before I submit them. However, I stand by what I was trying to say. Why is it that the gates of hell would prevail if the Church teaches false doctrine but not when the praxis is corrupt? This puts belief in extreme supremacy over and above praxis, much like the Gnostics did. I am not saying this as a jab against Catholics; Evangelical Christianity at least in the U.S. has much the same problem.
It is simple, you do not have Christ truly present in the Eucharist. Why constantly long to be with Christ knowing that you will have to wait until you go to heaven, when a few miles down the road Jesus is right there in that small Catholic Church you pay no mind to?
Well you could say that we don’t have Christ in the Eucharist. I say we do.

But did Christ not say “For where two or three are gathered in my name, there am I with them?” So why do you say we believe we must wait until heaven to be with Christ?
There is also the issue that we have been baptized into the Body of Christ and as such we are the presence of Christ in this world. I had a professor who once said the difference between EO and RC is the mystical and the literal body of Christ. Catholics believe that the bread of the Eucharist becomes the literal body of Christ and the Church is the mystical body of Christ. Orthodox, on the other hand, believe the Church to be the literal body of Christ and the bread to be the mystical body. Now I have no idea if that is true or not, but the fact remains is that due to our valid baptisms, Protestants have every right to claim to be the body of Christ.
P.S. On an unimportant note: “pay no mind to” is about as far from what I do to the Catholic Church that a Protestant can get. For purely selfish reasons, I wish I could be Catholic, but I refuse to be a “cafeteria Catholic” and cannot join until my issues are clarified.