Gary, if you want to protect your children, join another church and bring your kids, get involved with children's programs and social events so that they make friends. Choose a nice liberal church that doesn't teach hełł, and stick with it. Be involved in your children's social life. Your wife won't do it, so you organize play dates with non witness families.
there are lots of good children's bible study books, you can go to a bookstore and check them out.