I am a big fan of Petra, but I would admit that they have had a rather erratic history in terms of album releases.  Without question, Beyond Belief is one of the absolute high points during the years of Petra when John Schlitt was singing lead vocals.  And many would argue, with considerable justification, that this is the greatest album of Petra's storied career and, one of the best albums in the history of Christian music.  I would agree.