You got me, Susan (is that right?). Before I saw that site, I didn't even know there was anything called a "gospel chord progression," much less that there might be different types.

Another approach I have used is somewhat tedious, but perhaps quicker than sorting through various possible progressions. It's trying all the chords that are typically used in a given key. In a rough order of popularity, for the key of C, they are:

C, F, G7, G, C7, Am, Dm, Em, D/D7, A/A7, E/E7, Bb, F7, Fm, Ab, Eb.

I'm not so sure in minor keys, but this should be a good start for Am:

Am, E/E7, Dm, G, C, F.