The Church is a body of human beings, and it has all the weaknesses of human beings. Our Lord took upon himself that weakness. He failed to win over hiusown people. He came unto his own and his own knew him not. But by "sticking to his mission," he triumphed over the greatest failure of all, which is death. The Church is like Israel. He will never forsake themor us, but even when they had the ark of the covenant with them, they strayed. We likewise stray, but all have the assurance of victory if we follow the Way. It is not the Church that is the cloud by day and the pillar of fire at night, It is the Eucharist.
That would be true if the Church were MERELY a "body of human beings". That is the difference between the True Church and any other religion or even secular group. It is not "a body of human beings with all the weaknesses of human beings." It is the MYSTICAL BODY of Christ. Christ and His Church cannot be separated. This is a very common misunderstanding, the theology of which you can research yourself if you want. My intention is not to get into an argument, but offer this viewpoint because it was really illuminating once it was clearly explained to me. Thanks.