I've been struggling with this question myself recently. How can I pick a religion if doing so means that I am saying that one religion is more true/right than the rest? I have come to the conclusion that all religions have truth within their sacred texts but none of them are the truth. I have also been going to a Unitarian church for a few years and I enjoy being part of this community, because Unitarians have no creed, only the wish to gain a spiritual understanding through the teachings of Jesus and other religious sources. This, I feel, is a good way to look at religion, a collection of traditions which contain wisdom and truth that can help us live spiritual and fulfilling lives, rather than following one religion and be restricted to one creed.
I agree with
I, Brian that the cultural routes of our many religions are the reason that they are so different. I would also say that the problem of religious conflict comes about because when we decide to follow a particular religion, this very act denounces all of the other religions as less true than the one we have picked, and a self defensive mechanism can take affect were coming into contact with other religions can make us feel insecure about our own religion and feel the need to defend it as truth, which can mean describing the other religions as false.
Going back to the routes of religions I have a possible path that humans might take when forming a religion:
1) An understanding of their reality and habitat (climate/landscape/animals)
2) Concepts derived from this understanding (There is a power behind the weather, sun and rain, behind whether food is available or not, etc)
3) Imagery created to illustrate/visualize these concepts (Cave paintings, storytelling, etc).
4)Theology developed from these concepts and imagery.
5) Production of iconography and/or literature from the theology (Holy texts, paintings, religious symbols like the cross or star of David).
6) Religion is formed.
7) The idea that the chosen/developed religion is the correct view of nature and reality.
This, of cause, is just my own opinion derived from my own musings.
Also, although this process, I believe, is the general route of our religions, the wisdom that is evident in each of them has a commonality that shows that this wisdom is universal and that religious enquiry is a process that allows us to decipher it. This wisdom, once fully understood, should be beyond classification by religion, or any other means. There would be no boundaries and no prejudices. There will not be one religion, there will be no religion, only one understanding of reality.
TU