Sounds familiar?

http://watchtower.org/e/rq/article_13.htm

True Christians?
Or true Muslims?

Edit (21 Sep 2014)
The web address now points to jw.org where the original article doesn't exit any more. The closest version on the new website can be found here.

You can read the original article, using Archive.org's "Wayback Machine". Try the version of the page cached on Dec 2, 2010 here.