Well, not exactly. This suit was directed against the college, and one of his followers who teaches it his college.
One of my first philosophy teachers was Surrendra Gangadean, way back in the spring of 1973 (!), at Phoenix College. I took a logic class from him. I was 19 at the time. It was interesting to me to meet a Christian in philosophy. However, I spent much of the semester arguing against his Calvinism.
I was rather surprised to learn that a course at his present institution, Paradise Valley Community College, not him, but an adjunct at that college, was sued for using his book as a text, which the plaintiffs thought violated the establishment clause, because it advocated Christianity.
Now, using the classroom to advocate my own positions is certainly not my style of teaching. I have this nutty idea that if I do my best to fairly present all viewpoints, students will have the best chance to reach the truth, which, of course,accords with my beliefs. You can't keep your own positions in the closet completely, however (especially if you're a blogger). But lots of professors advocate their own positions. A lot of people have the image of the atheist philosophy professor who does everything he can to convert his class to atheism. Some 25 years ago I heard of a well-known philosopher at the University of North Carolina who taught a philosophy of religion classes with the expressed purpose of destroying the faith of his students.
If Mr. Gangadean got sued, why don't these people get sued also? Oh, wait, it doesn't violate the Establishment Clause, because atheism is to religion what not collecting stamps is to hobbies. Yeah, right.