They certainly talk a lot against Christian religions especially catholicism but hardly ever against the Moslems or the Jews.
When a JW talks to me the sales pitch comes to a screeching halt when he hears the words, "I'm Jewish". Now he has to convince me that Judism is defunct and Jesus is the Messiah and then overcome the Jewish expectation of a human messiah that brings world peace. Next he has convert him to a Jesus the messiah who started ruling invisibly in heaven in 1914 and picked only the WT Society to be his true Church in 1919. It is all too much work for a JW. They are now only harvesting the low hanging fruit that is left,ie- Christians who don't use the Internet, don't go to church, are lonely and seldom look at the Bible.