Since I see a lot of interest in finding Protestant Websites, I thought I would post this one.
The main page is called Carm.org.
This site has been around for a long time, and it doesn’t kick people off just because they are Catholic, in fact over the years I have never seen anyone kicked off for his/her Catholic teachings.
But on another note, for the most part, there tend to be some very good arguments questioning Catholic Teaching, so if you aren’t strong in the faith, I would advise against getting tangled up over there.
Actually I like their “threaded format” better than other website formats. It is more suited to a debating style than any other website I have seen. I wish Catholic.Com would provide an alternate format like this one. Although I do still love Catholic.Com.