Did you perform a Nandroid Backup of your stock ROM before installing Android Revolution HD? I am assuming not.
One popular way of going back fully stock in order to receive OTA updates and such is installing a RUU, but that will require Windows, which doesn't answer your problem.
Sometimes people make Nandroid Backups of their stock ROM for others to use it in the future, and I am going to look if anyone has done that with a stock AT&T ROM.
Thank you and I did perform an initial backup but its not showing up so either I deleted it or it got thrown somewhere on my computer that will be tough to find. Thanks for the info about people posting their nandroids though!