The short answer to your question of why Christianity rather than Islam or Judaism, Sultan, is Jesus of Nazareth. While Judaism, Christianity, and Islam are the world’s three great monotheistic faiths, genetically related and so having much in common, what divides them is their account of Jesus. I think that neither Judaism nor Islam gives a satisfactory historical account of the person and work of Jesus of Nazareth.
My interest in Islamic thought was sparked by my study of the history of the so-called kalam cosmological argument, especially its development by medieval Muslim theologians like al-Ghazali. In fact, it was due to their contribution to the development of the argument that I dubbed this version of the argument, which goes back to the pre-Islamic Christian era, the kalam cosmological argument (“kalam” being, as perhaps you know, the Arabic term for Islamic doctrine). You can read about their contribution to this and other forms of the cosmological argument in my The Cosmological Argument from Plato to Leibniz (London: Macmillan, 1980).
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