I can only guess as to why. It states a few times in the Bible reasons why we're here, and they all point to us being here "for God". Why God wants us here is not stated explicitly, though there are some hints.
In all reality, we could very much be a game to him. Maybe, since he is omnipotent, he wants to create something that isn't and promise himself he will let it grow just to see how it turns out. Who knows?
Very well, so you resign the argument of knowing our purpose in life then? When you say you can "only guess", you are saying you have no clue. Which is fine. It is not necessarily a weakness to not know the meaning of life. But do not then later talk to myself or others as if you do.
Judging by your response, you seem to believe in the typical version of the christian god: Omnipotent, omniscient (which is implied from omnipotence, actually), and omnibenevolent. Is this correct?
Let's dissect these attributes one-by-one, shall we?
1)
Omnipotence. Aka: being "All powerful". This is about as strong of a statement as can be. It is equivalent to saying: the "omnipotent being is incapable of nothing", or "every action is able to be done by this being."
Here are some direct and indirect contradictions created by an omniscient being:
a) The "Can god create a rock so heavy than not even he can lift"? This really does hold more weight than you may give it. An action is presented, is god capable of doing it?
b) A being outside our physical world (as is typically stated of the christian god) cannot interact with our universe. Doing so violates the principle of locality and thus causality. And I hope you understand the significance of something violating causality. It is functionally equivalent to being contradictory.
As said by Stephen Hawking: (not a direct quote, I'm having difficulty in finding it again) "If there is a god, he created the universe in such a way that not even he can interfere with it."
2)
Omniscience Aka: "All knowing". This is actually implied from being omnipotent, but it is typically talked about separately. Again, here's some contradictions that arise from the existence of an omniscient being:
a) This being then must know the future exactly and precisely. Right off the bat this violates the Heisenberg Principle of Uncertainty.
b) Omniscience directly contradicts Free Will. Free Will is something that is also typical in christian dogma. Yet you cannot have both. I believe RDK previously in this thread posted a quote from me addressing just this issue.
Essentially, the problem is with choice. In order to have Free Will, one must have options. A die with all 3's on it hasn't much choice about how to land, does it? Well, if god knows what you are going to eat tomorrow, that means you are not really making that choice. The feeling of choice is an illusion, because someone already knows what you will "decide" before you decide it.
c) God must also then know all future actions of himself. But if he already knows what he is going to do, which means that he himself does not have Free Will! This is a clear contradiction of Omnipotence.
3)
Omnibenevolence. Aka: "All loving" or "Perfectly good". I'll get right down to it:
a) The notion of omnibenevolence presupposes that there is an objective moral standard. Of course this is absurd, however. Certain actions to one person are very favorable, yet to others are a grave offense. Morality itself is subjective, and as such, there is no sliding scale upon which to be "ultimate" of anything.
b) But let's suppose that there IS an objective moral code. You are left with Euthyphro's Dilemma, as I posed earlier. Is god subject to this moral code? Or was the moral code created by god?
You'll find that either way, your god is in trouble.