Yes, I totally agree, Neal is a great musician (more than just a singer) and he has ever comosed wonderful music, since the first astonishing Spock's album, The Light.
Even his last work in the band, Snow, is already a classic masterpiece of prog but I think the best things he wrote are Testimony and One; I also agree with you when you say that Spock's are no more the same since Neal left....... unfortunately they are just a weak shadow of what they were before......
About the lyrics (and so the christian aspect of his music), I don't care a lot about them, because (and this appens for me in general with music) I love much more the musical aspect and this is also (part of) the reason why I love progressive rock! Â
So, for example, when I'm listening to The Promise (from the first part of Testimony) I remain astonished from the great armonized melodies of the voices very much more than the words they sing....... Â
But this is, of course, just my opinion...... I'm happy to know other people "loving" Neal's music..... I think he is, nowadays, the best prog-music writer in the world!!!!!!!