good start doc. Here's a few pointers.
What I would recommend is that you work on your phrasing. The notes sound to "planned out" if you get what I'm saying. You gotta put some spirit behind those notes.
Do this. Listen to one of the mothers of the church as you hear them back up the preacher. Then hum those notes to yourself exactly how you hear them singing them. Now translate that to the bass so that the bass sounds exactly like that line.