All religions can be reduced in essence to revelation, that is to say, one person communing with ‘god’ or his agents to gain knowledge. A religion may be based on a singular revelation, or on a series of revelations from a string of ‘prophets’. Revelation is then passed down as oral tradition, which becomes written tradition, or, as in more ‘modern’ situations, passed directly to written tradition.

My question would be, is revelation a valid source of knowledge?