As a young student, Sybok was exceptionally gifted and possessed great intelligence. It was even assumed that one day he would take his place among the great scholars of Vulcan. Sybok, however, was a revolutionary, as the knowledge and experience he sought was forbidden by Vulcan belief. Sybok rejected the idea of pure logic, preferring instead to balance it with emotion of his Vulcan ancestors. When he encouraged others to follow him, he was banished from Vulcan, never to return.
During his studies, Sybok received visions given to him by what he believed to be "God", beginning his journey for a place in Vulcan mythology known as Sha Ka Ree
OK, so granted. Anybody, even a Vulcan, can wonder about God. But I sincerely doubt that Star Trek era mainstream Vulcan religion was meant to be theistic. As for "gods of our forefathers" "prayers" and the Kalifee I'm going to guess that this is a case of different aspects of a culture not always "gluing together" perfectly. They had certain beliefs and customs that were for the most part, but not completely, displaced by the teachings of Surak. Or more likely, they were glued somehow whether they really fit or not. Just like christianity has incorporated elements of Greek philosophy. In the case of Thai Buddism, there are spirits house, that look like little bird houses. People build them to lure ghosts out the real house into the spirit house). Well, if I understand correctly, the existence of these spirits doesn't quite jive with the idea of successive incarnations until one reaches Nirvanha. But the belief in spirits predated the belief in Buddhism, so there you have it. I can easly see Vulcan culture involving a mix of old and new, with Surak's logic overlaying these older practices: meditation, prayer, or whatever.
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Thanks 
