there are many, many religions.
many of them making similar claims to their final authority, and many saying similar things socially / ethically. all of them hold out exclusive offers of peace, meaning, truth, and "rightness". even a pantheist who believes that all religions say the same things in different ways will believe herself "more correct" than a Christian who points to Christ as the only way, or a Hare Krishna who holds Krishna supreme over any other god or divinity.
i would say that the world faiths fall into two broad categories- one that sees man's spiritual goal as impersonal merging with a greater, abstract Cause or Being (usually through meditation / enlightenment), and one that takes the personal difficulties and joys of man to the feet of a personal divinity, and cries out / praises with an emotive voice. one sees God as a goal to be attained / realized, the other sees Him as Someone to be communed with.
there are many, many ways to imagine God. many ways to adhere to the belief that all faiths say the same thing / lead to the same place. and many ways that will claim to bring one closer to God, whether through contemplation or worshipful acts / good deeds.
yet i know of One unique Person who can bring one to the place where one walks with God, and knows Him. Christilogically, He is the only Teacher who is truly One with the Living God, who knows God and is from God, who teaches a Way that is so, so simple, that it never would have occured to me in a million years. and He teaches not through a bok or list of concepts, but with His life. He is the Way, the Truth, the Life, the Gate.
it's quite honestly, a narrow door. and not all will / do enter in.
from a universalist perspective, if a faith makes exclusive claims, it can not be the one true faith. from a pantheistic perspective, God is "Something", and knowable to all- just look around, and comprehnd that He is here, all around, and within you, too. yet Biblically, God is known as Someone. Someone who can be known, walked with, fully loved, and enjoyed not through human understanding, but through His unique Son.
even a Baha'i will get around to "talking about Baha'u'llah" with a Muslim, Christian, Hindu, or Jew. universalism with which everyone is comfortable does not neccesarily mean "truth" in its fullest and deepest sense.