A few years ago, a coworker sat down next to me and said, "You know what I never understood about God, I mean, if he exists? Why did he create people then tell them to worship him? Does he need it?" Considering I didn't expect to have a theological sword fight during my lunch hour, I decided not to get too deep into a discussion. Without looking up from my sandwich, I said, "I don't think He needs it. Maybe it just makes him happy."
The guy sat back in his seat and didn't say anything. "I never thought of that before," he said. Then he stood up and walked back into the kitchen. Several hours later, he still had a rattled look on his face. "Are you alright?" I asked. "Yeah," he said. "I just... You really got me earlier." He never thought of God as secure in Himself.
During his message to the Athenians in Acts 17, Paul said, "The God who made the world and everything in it, being Lord of heaven and earth, does not live in temples made by man, nor is he served by human hands, as though he needed anything, since he himself gives to all mankind life and breath and everything."
Even though I don't fully comprehend it, I think God only does what will make Him happiest. I don't think He needs us to make Him happy. I don't even think our sin frustrates or surprises Him. Maybe our worshiping and serving Him is meant for us to join in the joy He has in Himself.
I wonder how many people like my old coworker view God as either insecure or demanding. I wonder how many people in the church assume this of Him as well.