God does not need you in order to be eternal, or infinite, or omniscient. But God created you, and God does need you, like an artist needs to create. Why do painters paint, and dancers dance, and singers sing? Because they need to, they have to. In creating, the artist expresses their own nature: who they are, and what they are, and for what they give their life. And so with God.
-Br. Curtis Almquist, SSJE