This sounds like it could get ‘interesting’. The speaker might come in there and talk about all the ‘wonderful’ doctrinal ‘changes’ that have occurred, at which point you may want to remind said speaker that Vatical II didn’t implement any doctrinal changes, and that any “changes” are either due to error and abuse by those in power, or are changes in disciplines and not doctrines. One particular subject that could come up is the Church’s supposed change in stance in regard to the Jews. This is a big one these days, and you ought to be ready to counter that there has been no change in belief about culpability (of Jews, and of us personally).
I can also see this taking a turn toward how great it is that the Catholic Church is more like the rest of the world now…Yeah, real great…just look at the figures you found.
You might want to just quote one stat: from Gallup (and N.D.) about Mass attendance, and just mention the serious decline in vocations. Don’t inundate the person with a million statistics about a million different things. Just ask the person how this could possibly be a good thing if on the one hand the Church is trying to compromise with the world, and at the same time loses most of its membership.
I don’t know if this speaker will put a positive spin on this subject, but there is nothing directly positive that I can see that came out of VII. The only positive things I see are now the ‘reform of the reform’ which is starting to happen. If only it were unnecessary!