What was the time frame that the pictish religion was around?
when did they start and when did they die out?
The first mention of the Picts was by a Roman chronicler around AD 300. They were a dominant force in what we now call Scotland for at least another 600 years, until around 900AD when they were absorbed into the nation of Alba. You can read on about the Picts from www.pictishstones.org.uk/pictishstones/pictishstoneshome/aboutthepicts.htm.