I'd like to point out, holier than thou snippy folks, that I was very much aware of what CK1 involved. :P My sig might kind of give y'all uppity peeps the clue to this fact. :P
And yes, the bug/exploit in the demo did make me thing pagans and Muslims would be playable in the full game. Frankly I quite enjoyed subverting Catholic vassals to Norse paganism. One of the things I was most looking forward to when I got home was cheerfully taking a pagan leader, ideally one of the two Low-Born Cuman Counts as I did endless demos of, and Norseifying the desert, then assailing Catholic Europe under the banners of Odin, Thor, et. al. So for that to be taken away did surprise me.
See, here's the thing. I didn't follow much, if any, of the hype and pre-release and all that. Why would I? I knew I was getting anyway so there was no sense being anticipatory about it. The demo was the first time I really paid attention to the prelease hype.