Does the Kindle support custom third party apps? I know the Nook currently doesn't, but the next firmware update is supposed to add it (I'm guessing it will be a modified Android development kit. If so, I'll be happy to help in the porting process from Android to Nook).
edit: I just looked at it and they have already released a development kit for the nook which is essentially the same as the Android SDK that Google releases.
http://nookdeveloper.barnesandnoble.com/tools#getsdk
It's Android 2.1 but should still work just fine for getting a version of Gospel Library compiled.
edit2: I looked a little more and found that this SDK is just a preview of the one that will be released with the next Nook Color update so developers can start building their apps. It would probably be worth vetting the current Gospel Library build against it, although since it's essentially vanilla Android SDK it should be fine.