It would have to be highly personal and customizable, which may undermine the premise.So what set of things would you include in a world religion, that will fit all in someway?
It will definitely not demand belief in any sort of deity, although I expect such beliefs to arise anyway and to need a place in such a global religion.
It will have a strong emphasis on expression as opposed to scripture. It will be highly social. Language will be a major feature of it, with lots of effort to develop both a common vocabulary and very specific, specialized jargons.