I don't think the Hebrews/Jews ever claimed an exclusivity. Moses knew virtually nothing of God until he hooked up with Jethro and the Midianites, descendants of Ishmael. It was there that he encountered his God and learned more of Him and received his commission. Apart from the development of monotheistic ideation as demonstrated by form and textual criticism, is a clear picture of the development of the knowledge of God: from Elohim to El Shaddai to YHWH. It is an ongoing refinement. Christianity, which technically is a cult of Judaism, offers a statement of the final revelation and fulfillment of prophecy. You can check out the other threads on "Faith" because it all comes down to a question of faith. Nobody, in this country at any rate, is holding a knife to your throat and demanding your heartfelt declaration. Ain't freedom OF religion, as well as freedom FROM religion, wonderful? I believe the original question was about THEOLOGY.