If corrupt clergy is sufficient to make them "want to leave," it's a cinch they didn't really believe and know what they believed in the first place.
Seriously: either it's true or it's not. If it's not, it's time to get out. If it is, someone else's failure to live up to it doesn't make it anything less than true. Or, put another way: if one Judas didn't make Jesus a fraud, a thousand Judases don't make him a fraud, either.
The truth of the matter is that Catholics haven't been properly catechized for close to 50 years. Add that to the "vicarious Christianity" outlook that many Christians -- not only Catholics -- have ["holiness is for priests or nuns or ministers; I go to church one hour a week and that's enough"], and it's a miracle of God's grace that any stayed.
There’s a big difference between the laity being hypocrites and the clergy.
If the clergy and leaders of the Church don’t even live what they teach and claim to believe, it does seriously cut into their credibility. Why should anyone think that what they say is true if they don’t live like they believe it themselves?
It boggles the mind that Catholics expect and demand that one stay in a corrupt, hypocritical organization when there are other churches out there. But then again, being told that the church you belong to is what matters in your salvation, it shouldn’t really come as a surprise.
People are waking up to the fact that church membership is not a requirement for salvation, that faith in Christ is.