Stick your finger in your ear.
Now why did I tell you to do that? It has nothing to do with gospel keyboard.
Why did you listen to me? I don't know either which brings me to my first point.
Every piece piano related material is not going to always benefit you.
I have a principal that I use.
Just because something has all the right information doesn't mean that you are going to be able to understand or even apply this information.
That's how the piano is.
You may get truckloads of music theory books, sheet music and charts but if you have no idea how to get it from the paper to your fingers it's useless to you.
That is especially true with gospel keyboard.
Gospel music is one of the cornerstones of music as a whole.
You will find everything from R&B to country music had roots in gospel.
So I think it's great that you want to learn how to play gospel keyboard.
In my opinion you are not going to learn to play gospel be reading a book or reading sheet music.
These things are good but if you really want to play gospel keyboard then you need something that is specific to gospel.
You could just ask somebody who play gospel keyboard, what they are doing.
See how much help you get.
Good Luck! I'm not saying you wont get help this way but you may find that your help is limited.
Many people who play gospel don't know what they are doing.
Of course many of them can play very well.
They usually don't explain the methods they use in a way that even remotely makes any sense.
And if they do know what they are doing many rarely have time to show you much.
Maybe they'll show you a couple tricks or chords but nothing to really get your feet wet with.
You are often left trying to figure out things on your own.
What you need are gospel keyboard lessons.
You need something specifically designed with gospel keyboardist in mind.
You need something that's going to teach you the techniques that will make you a successful keyboardist.
Playing great gospel piano is not as hard as you think.