So we believe the Church is Indefectible, which means, she cannot by her very nature, err from the Truth. This is true, in that the Church has taught that Jesus Christ, is “the Messiah, the Christ, the Son of the Living God”. She has continued to proclaim his Gospel for all to hear every day, at every Mass, since the beginning.
Does the Indefectibility of the Church mean that the Gospel Truth cannot be obscured? No, the dogma is clear, She can’t defect from the Truth, that’s all.
It is true, Cardinals have to take oaths, Popes have preached Crusades, the Gospel is not lived out literally in the lives of Catholics (in Holy Orders or not), but that does not mean that the Church has defected from the Truth.
I think it is fair to say that on the whole we have ceased to practice the Faith as it is presented in the Gospels. I can certainly list the times today that I have not loved my neighbour as myself. My sin is always before me. But, the grace is, in knowing that I do not do the good which I ought, I know, and therefore I can do something about it. I have can begin to change, to turn around, away from, the old way, and towards the only Way.
Despair begins when we deny the mystery of things, and I can certainly vouch for the baffling mystery of how the Lord has permitted the Truth to be so obscured.
But I know that my job is to work on myself and not to worry about the wider workings of the world.