According to Wikipedia, OWU “was founded in 1842 by Methodist leaders and Central Ohio residents as a nonsectarian institution, and is a member of the Ohio Five — a consortium of Ohio liberal arts colleges. Ohio Wesleyan has always admitted students irrespective of religion or race.”
It is pretty secular. 59% of students do not declare a religious affiliation. No religion courses required to graduate.
Wittenberg, St. Olaf, and Luther are tolerant of diverse religious backgrounds, but have more of a Christian identity and require some coursework in religion.
For Wittenberg - one course in Philosophy or Religion required
St. Olaf and Luther - require two religion courses, one of which must be a Bible course, these are taught from a scholarly perspective