That's not a real answer. That's like saying "you knew this game had bug "x", why did you buy it anyway?".
I guess Paradox has all the right to reserve that part of the gameply for a paid expansion. No need for any other excuses.
It's no bug and if either of you would care to read the lengthy explanation (because the simple one didn't seem to be understood) you wouldn't be arguing over it.
I mean, why isn't bisexuality in the game if homosexuality was included ? Huh ? What about naval battles or trade goods ? There are lots of thing "missing" in the game and it doesn't make it broken/half-done or anything like it.
AND on top of that, as i understand, you CAN actually play as muslims and pagans, you just can't START as one. Peace, out.