I know I'm late to the party (story of my life) but I just wanted to note that implicit or explicit in the writings of the world's revealed religions is the answer to this question. Christ, for example, poses it as a matter of "fruits" (one of the quotes that prompted Christopher Hitchens to criticize His grasp of agriculture ) If you look at the core teachings of the claimant and extrapolate what a community built on them might look like or what effects they might have in a person's life, you can get a sense of what the fruits are.

Bertrand Russell said that if every one lived by Christ's teachings as enunciated in the Sermon on the Mount, the world would be transformed. Alas, while many individual Christians attempted to live by those teachings, Christian institutions did not necessarily do this with the result that rather than looking for ways to keep to Christ's major injunction (love one another) as they maneuvered past hostile non-Christians and internal disagreements, they allowed doctrine to trump obedience.

The Baha'i scriptures tell us that if one looks through history, one can see these individuals and know them by their fruits. By the lives they led and the ideas they espoused. They were not men of their time. Their teachings were all revolutionary (or evolutionary) in some way. Take Baha'u'llah's teachings about the harmony of science and religion or the equality of women and men. Would you expect those to come out of 19th century Iran?