Does God have needs?

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I think you answered your own question, Ernest.  Indeed, one can assume that a perfect God would suffice without anything to involve Himself with.  However, just as God has needs, He has ways to fulfill those needs.  Thus nature, man, and animal exist at His whim, testifying to God's desires.

We can look at this problem another way by taking sin into account.  God has a need, or at least a desire, for people to do good; yet God is denied that every time someone does wrong.  So God hopes for people to do good, but that desire is outweighed by His desire for people to have free will.  God is, from this perspective, making a personal sacrifice for the sake of Man.

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Indeed, one can assume that a perfect God would suffice without anything to involve Himself with.

Why?  What does solitary introspection have to do with perfection?

It doesn't.  I'm only saying that it's a common assumption.  It is believed that God will simply dismiss a need or want of His, rather than seek to fulfill it, such as by creating Man.