By LYNNE WEISS
There’s a big church conference in West Berlin and the streets are amazingly crowded, but many shops are closed. It’s the perfect day, we decide, to visit East Berlin, the land of Godless communism, as my husband Bob calls it. We hope to find bookstores selling cheap editions of classic books (Marx, Goethe). Also, because we are traveling on a tight budget, as always, we hope for some inexpensive but substantial meals. The Wall has been down for about seven months, but East and West are not yet unified, and they still have separate currencies.