Well, I can only speak for myself here.
I left Catholicism during the priest sex scandal. The last time I went to Mass, the homily was centered on why we should keep giving money despite this “challenge”. That was it for me and my wife. We left and did not return. That was 3+ years ago.
To be honest, it wasn’t the priests who sinned that prompted my leaving - it was the bureaucratic a**-covering that followed. I have no respect for and will not submit myself to the authority of men whose desire for power and authority overrides their commitment to the ideals they are supposed to uphold. The bishops came face to face with evil and chose to hide it and/or ignore it in the interest of maintaining their power. That, to me, is unpardonable.
Of course, there were other issues that had been building within which made leaving all the more easy, but the catalyst was the bureacratic bungling in this issue.
Of course, here at the Catholic Forum, I don’t expect to hear “Amen, Brother” for the above viewpoint, but I offer it nevertheless.