You have created a nice choral piece. Unfortunately, the gospel is lacking. I have been playing gospel music by ear in churches since my boyhood days and it is something I continue to study and stay current with just as I do with classical music. I too blend the techniques and philosophies of gospel into my classical choral/vocal writing.
The one thing I think you should ask yourself is what type of gospel music are you trying to write? Gospel like othe forms of music vary in style depending on the era. Of course certain techniques will remain consistent but again, the application changes depending on the time period. Aside from that issue, your voice leading is a little "too classical". That's not to say that gospel music doesn't require good voice leading, its just in a different manner. Gospel music is also usually voiced for SAT or SAB (Baritone). Also, you CAN have mostly diatonic harmonies and still produce a very strong gospel sounding piece. Rhythm will play and important part as well.
I suggest that you listen to some gospel music from the different time periods to get a better idea of what you want or need to do. For the most part the eras of gospel music usualy only last about a decade.
1950's/60s, 70's, 80's, 90's etc. It may be hard at first to recognized what has changed in the music of the various decades, but once you can identify the differences those same differences will seem like night and day!
You have a good choral piece. I wish you good luck on the rest of your composing.
