> I keep hearing reference to the scarab cabal...is it a true cabal or is it just a means for worshiping Scarabaeaus? Different than trying to get a tattoo, etc. from other Gods?

The Scarab Cabal does NOT exist, it has not for quite a while now. All signs point to a re-emergence being as likely as Sarah Palin doing a smart move.

> Are there cabal abilities that can be gained?

There is no cabal, so no. There's the religion based tattoo ofcourse.

> Can you also be in one of the other cabals if it fits your role?

Short answer yes, long answer: it's complicated.