Regardless, I can appreciate the weariness everyday Catholics feel in fielding these questions. Much of my family is Irish Catholic, and I wouldn't broach the subject with them.
As for the good works the Church does, that really is inconsequential. Hamas runs schools, and Pablo Escobar was a pillar of the community. The good works one does do not absolve one of one's sins. My biggest problem with the Church and its apologists is the rather offhanded manner in which these issues are shrugged off. "Yes, we raped thousands of children, and provided the rapists with access to further children, but we're better now." "Yes, we told millions of uneducated people in AIDS-ridden sub-Saharan Africa that condoms increase their chances of getting AIDS, but the jury's still out on that."
I would have no problem forgiving the church if they offered a genuine mea culpa, turned in every child-raping priest to the authorities, and reversed their policy on condoms in AIDS-ridden and over-populated areas of the world. Far from that, however, Mr. Ratzinger has only further exacerbated these issues. I don't believe that mere membership provides material support to these activities, but every dollar you put in the donation plate does.
As for the "child abuse" issue: My dad was raised in a Catholic neighbourhood, and attended a Catholic school. The nuns would smack him with a ruler if he answered a question wrong. That's child abuse. Putting your penis inside a child is child rape. There is a huge difference between the two, and suggesting that the latter is equivalent to the former smacks of equivocation.
I understand that you are not your church, just as I understand that Israelis are not Israel. Like that example, however, the support that you provide the church, be it direct or otherwise, is at least partially responsible for its actions. Just as Israelis are responsible for the atrocities carried out against Palestinians, just as Americans are responsible for the atrocities inflicted on Iraqis, Hell, just as we Canadians are responsible for the actions of our government, so too are you responsible for the actions of your church.