Well, the thing is that the games don't explain any of Raziel's life before he became the lead Inquisitor. You're just basically supposed to assume that his life was fairly commonplace until he joined the Sarafan ranks, just like you're supposed to assume that Kain's life was fairly uneventful until he was murdered and resurrected. So, no, I can't go into any more detail in that regard.

However, even if I could, that would add another giant chunk onto what is already going to be a pretty massive read. That whole thing was just backstory. Tomorrow I'll be detailing the events of Blood Omen, and that's going to probably be longer.