According to one dictionary, philosophy is the study of the nature and meaning of existence, truth, good and evil etc. And a philosopher is someone who studies and develops ideas about the nature and meaning of existence, truth, good and evil etc.
Personally, I prefer to boil down this definition to just philosophy is the study of the nature of existence and truth. It follows thus a philosopher is someone who studies and develops ideas about the nature of existence and truth.
The inclusion of meaning assumes that existence has meaning to begin with. Here, I beg to differ (or perhaps go along with existentialists like Nietzsche, Kierkegaard and Sartre) and point out that nowhere does it say life has implicit meaning, that only we have assumed it to have meaning, and a universal one at that. It is for this reason I believe that Western philosophy tends to think Eastern Philosophy, particularly Buddhism is nihilistic in outlook.
Thus, Western philosophy has a tendency to belittle relativism and relativistic meaning. They are happy to say things like the only constant is change and not blink an eyelid at the relativity and even the contradiction in the statement or proposition. One must also see the nature of language (move towards a philosophy of language) in order to understand the nature of knowledge (epistemology), the nature of existence (ontology) and the nature of reality (metaphysics).
And so I must therefore question the nature of religion as well. I have never known a religion to be personal, for one person and that person alone. If it were then its god must be non-universal. In short, religion is a social act. If it were a non-social act then we need not talk of church and religion in the first place. But the fact that we do have church and the concept of a religion we must assume religion to be above all else a relativistic social construct. And if so then the talk of good and evil must also be relativistic as well. Philosophy, therefore, must reject religion, or at least study religion as part of the nature of human existence, not to assume it is part of or above philosophy as such. There is what I will suggest here as not so much a philosophy of religion but a religion of philosophy, and that it has infiltrated Western philosophical tradition so thoroughly that it had almost escaped notice.