In theory, Muhlenberg is officially a Lutheran college (as are Gettysburg and Susquehanna).
http://www.lutherancolleges.org
But the Lutheran part is optional. In practice, Muhlenberg seems to be particularly popular with Jews.
http://www.baltimoresun.com/bs-mtblog-2011-03-lutheran_college_hot_among_jewish_students-story.html