The Facebook page was supposed to be devoted to the fallacies and sophistries of Surrendra Gangadean, but I actually saw no discussion of his arguments, or the arguments in his book. Instead, the site seemed to be devoted to the charge that he pushes his religious beliefs on his students, that he uses his classes to recruit students to a Christian fellowship he heads, and it was there that I discovered the lawsuit that was filed against him based on the Establishment clause. To read that site, he uses his classroom to run what amounts to a cult.
What seemed to me problematic about all of this is that there are plenty of people who make a case against religious belief in their classes, and this is done deliberately with the intent to get people to give up their religious beliefs. If the Establishment clause can be used to beat religious professors over the head for defending their religious beliefs in class, but unbelievers can bash religious belief all they want, this creates an unfair asymmetry for the believer.
However, I have been in contact with someone who is a good deal closer to my former teacher than I am, and he tells me that I was insufficiently critical of the factual content of the Debunking page. Professor Gangadean does not use his classes to recruit for a fellowship; in fact, he does not make his own beliefs especially evident in his classes, and often plays devil's advocate against the positions he himself holds. If so, he doesn't operate much differently from the way I do. I do think the description of my former teacher's activities by his debunkers is tendentious at best and deceitful at worst.
Most teachers have beliefs which they make evident to some extent in their class. After all, we do believe things, and we should be able say that we do believe them. I know fellow Christian instructors who are more forward about their own beliefs in class than I am. If, on the other hand, I thought that many of my students were getting a lot of anti-religious intimidation in other classes, I might advocate more for what I believe than I do. I do feel a primary responsibility to teach the curriculum. I sometimes get asked about my own beliefs, and typically I will defer answering until the end of the semester. I try to make sure that, whatever you are a believer or an unbeliever, you will be able to say when the class is over that your view was competently represented.
What I am saying is that I could be more of an advocate for my Christianity than I in fact am, and if I were to do so, I should not have to be concerned with lawsuits and the Establishment clause. The marketplace of ideas should be left open to all viewpoints, including religious ones. The idea that religious professors are obligated to lean over backwards to be neutral, while anti-religious can be unremittingly hostile, is a situation which is far from what the Founders had in mind when the laid out the laws concerning the establishment and free expression of religion.