I found a protestant site -- #2 on Google when you search for "Catholic doctrine" -- full of age-old protestant errors.
Anyhow, the page (not really a full site) doesn't seem to be updated often, and it's not even that optimized for search engines! That is, they haven't done much SEO (Search Engine Optimization).
SEO is in my line of work, as it's related to web programming.
Anyhow, I think it would be great to EDIT their exact webpage, only REPLACE THE LIES WITH THE TRUTH including scripture quotes, etc. I think the info is all out there, and much of it could be done off the top of your head.
I could take the resulting file, and optimize it, then host it on my website and submit the page to Google, MSN, and Yahoo search engines. It would end up with a higher place than the original error-filled page, and many confused souls might be saved!