One does not have to imagine what the future in the United States for Christians may look like if current trends summarized under the heading "tolerance" continue. Europe provides a very good case study of the impact this has on Christianity. The Observatory on Intolerance and Discrimination based in Austria has issued a report describing this. An introduction is provided along with a link to the full text of the report which is also available here. It is worthwhile reading since it uses real examples to illustrate what discrimination against Christianity in Europe looks like.