The short answer is yes. I have been playing since beta and OrdoMalignus is the cabal I started. It is maxed out and if you want to join just put in a request. I am the Grandmaster, so you can always have a spot and I have 4 spots open currently.
Psalm Doctrines are what make or break a build. Not all builds are equal. I highly suggest you visit this page to get the information you need. Granted as you get higher level you will become stronger due to skill points and better gear.
Warhammer 40,000: Inquisitor - Martyr - Compendium - NeocoreGames
I am Brostrodamus in game.