The Popul Vuh is a compilation of Maya religious belief. Search on Professor Edwi Barnhart and you will find his Maya research site with a lot of interesting information.
Edwin.
The late Igor was very interested in the Popul Vuh, but that was in the days before home computers, and he was too lazy to go to the local library (at the time, we lived in the Bay Area) and do the research needed. Considering where we lived, he probably could have learned all he wanted to about it.
Me? I have the interwebz! ;o]