show creators Matt Stone and Trey parker talk about how they recorded full versions of the songs played by the fictional Faith+1 band. They claimed that they were going to release these songs as a full album...but this never happened. They also talked about releasing these songs for free, as the message of the episode was about how internet piracy is essentially a victimless crime and they don't care if they make money off these songs. although this never happened either
Ya I know for a fact one of these lost songs (one not featured in Christian rock hard) was featured in the episode "the death of Eric Cartman" season 9 episode 6