The Hopi Indians thought that the world's religions each contained one spiritual thread, and that these threads are always seeking each other, wanting to join. When all the threads are finally woven together they will form a rope that will pull us out of this dark cycle of history and into the next realm. More contemporarily, the Dalai Lama has repeated the same idea, assuring his Western students repeatedly that they needn't become Tibetan Buddhists in order to be his pupils. He welcomes them to take whatever ideas they like out of Tibetan Buddhism and integrate these ideas into their own religious practices. Even in the most unlikely and conservative of places, you can find sometimes this glimmering idea that God might be bigger than our limited religious doctrines have taught us. In 1954, Pope Pius XI, of all people, sent some Vatican delegates on a trip to Libya with these written instructions: "Do NOT think that you are going among Infidels. Muslims attain salvation, too. The ways of Providence are infinite."
-- Elizabeth Gilbert <Eat, Pray, Love>