John Schlitt (lead singer of Petra) Interviewed

Tim Challies gives this update on Petra:

Though the band retired on December 31, 2005, John Schlitt and Bob Hartman are keeping active. Schlitt will be releasing a third solo album later this year and he and Bob have also recorded a praise and worship album called “Vertical Expressions”. It will also be available later this year. John was recently a guest on LIFE Today (click here and scroll down to October 19) where he and his wife shared their testimony.
Petra was a fantastic group through the 1980s and the 1990s (don’t forget the Greg X Volz days!), and it was a blessing to get a bit of an update. Thanks, Tim!
Does anyone know where the members of Petra stand theologically? I’m just curious. I’d also appreciate any update on what Greg X Volz is doing nowadays.