A difference between this and other histories of philosophy is that this one does not detour into what most others give, namely, accounts of the theologies of Augustine, some of the Church Fathers of early Christianity and the ‘Schoolmen’ of later medieval times such as Aquinas and Duns Scotus. This is a history of philosophy, not of theology and religion. – A C. Grayling (from The History of Philosophy)
Here is a good example of anti-Christian bias. Furthermore, he is wrong, theology is philosophizing from a presupposition. Just because their philosophy included a God doesn’t mean that it wasn’t philosophy.
Just to demonstrate his anti-Christian bias, all you have to do is notice that he includes Buddhism, Confucianism, and Jainism. He claims that Jainism “is not a religion but a philosophy.”
And the fact that he dedicates several pages to Spinoza, the God-intoxicated man, proves again his bias. For as long as the God to postulate is not a theistic God, then you are doing philosophy. But once you postulate a theistic God, poof you are no longer a philosopher.
Philosophy deals with the existence of God, but, it seems, that once you affirm the existence of God it all of a sudden stops being philosophy. The same activity takes place before affirming the existence of God and after affirming the existence of God.
The simple fact is that theology is philosophy, it is just that it is bad philosophy.
If Mr. Grayling didn’t want to write about Christian philosophers, fine, just say that. But to deny that what they did was philosophy is just plain wrong.