Yes, ultimately the accusations of "bias" rest on some kind of assumptions and standards. The point someone made about pro-Islamic bias in contrast to perceived anti-Islamic bias, and pro-Christian or anti-Christian bias all needs to be evaluated according to criteria. In fact, trying to get "objective" is what that means, and actually itself reflects the scientifically influenced discourse of University-based scholarship. Does that have an origin? Modern secular ideology likes to hold that it is unbiased, or seeking to be, in University secularism. The UN, for its part, "secular" in most respects, has that funny document, the UN Universal Dec of Human Rights. Well, that´s funny. It turns out that forty plus Islamic countries, their governmental leadership, has opted to refuse to sign on. They call it too "Christian." They have formed their own 1990 agreement, the Cairo Dec of Islamic HR based on Sharia Law.
University-based "objectivity" is associated with that UN document. Uh oh. Guess what that corresponds to? You guessed it. The Age of Enlightenment wasn´t an atheist phenomenon, and secularism wasn´t an atheistic strategy. It is part of Christian modernization. John Locke can be held up as a representative thinker, and he wrote The Reasonableness of Christianity. Yeah. Christianity is more complex than most people recognize. And "secularism" has been distorted. So expect conflict and confusion while people throw terms around without getting clear on their own underlying assumptions. It is all waiting to be discovered in the University-based resources of scholarship, however....