Is that god still waiting for someone to come and get him?
Who comes to your mind when you hear the name "guitar god."
That's probably just the god of mischief.
God (formal name ender) is God! Or the gods, if you're talking to more than one. You have to be polite to them, so you add that ender on there.
The readings for this word are both kun'yomi readings. You've learned them both already so you should be able to read this too!