-is god merely a replacement for santa-clause when you get older and stop beleiving?
No. (BTW move the N to the end of santa and see what you get)
A feer tactic to keep people in order?
Nope.
-maybe the world and life itself is just so messed up that we need some sort of hope.
Life is pretty messed up and we need the hope only he can provide.
-what if it's just false hope?
It's not.
-what does he/she/it look like?
He/She would be technically correct seeing as how god is describe as being both in the Book of Genesis (in Hebrew of course). Though if you read on the the older Hebrew I believe god prefers to be referred to in the masculine manner of he.
-is there a heaven or hell?
Both are quite real I can assure you.
-will we go there weather we're notty
If your naughty (and we all are to some degree or another) fortunately you've been given quite the generous grading curve. All that's necessary is to repent. (I'll give a more in depth definition of repent if you'd like)
or nice?
I believe the same rules apply. Because we've all been naughty (as you putt it)
-why do we need a reward such as the thought of heaven to keep order?
That's an odd way of putting it. We need god's law to keep order and god to get to heaven.
-why not just love people?
Why not indeed?
-does he have a purpose for us?
Yes, in very short to glorify him.
-why cant we just live and die without having to wander?
Cuz Satan don't like ya.