@Leadfoot,
Our OP asked about belief/disbelief in God. I'd hate to hijack this thread with a different tangent, but I'll touch on some of my thoughts.
Your questions are the natural next step in any discussion of human creation, and I'm sure you understand that the 'mindset' of any self-existing, eternal entity responsible for the creation of our physical universe is nearly impossible for us to wrap our heads around-- I still struggle with the very idea of infinity!
For those of us that seek a more literal truth that transcends mere 'feelings' and 'faith', all we can do is approach things analytically, look for clues in the world around us and the texts that have been left by the ancients. But I believe that our God cares for us, and makes himself known... endowing us with the capacity to humanize and personify him in our relationship.
One thing I constantly remind myself is that like scientific fact, spiritual truth hasn't changed over time... just our understanding of it. We are constantly shedding old scientific ideas in light of new findings, and I believe it is OK to do the same with religion. Obviously that's not the way religion has portrayed its theologies. Ever.
But in the midst of an informational revolution, we have the luxury of perspective-- the ability to glance back at the whole of human history in juxtaposition of the sum of human knowledge that lies at our fingertips.
One of the overarching themes that have permeated human spirituality is the idea that our actions in this fleeting, temporary existence will have a profound impact on the next. Hindus, Muslims, tribal groups... you name it. Realizing this, I took the lead of Jefferson and Tolstoy and decided to rip the life and teaching of Jesus free from the chaff that surrounded it. Doing that allowed me to understand that this was his basic message too. Jesus winnowed down God's rubric to two basic traits... love God with all your heart, mind and soul and love your neighbor as yourself. Criteria that could easily be applied to anyone at anytime in history, regardless of the details of their beliefs or culture.
On top of that... his arrival was perfectly timed and has steered the course of humanity in undeniable ways. For better or worse, belief in 'him' has sculpted government, global exploration, settlement patterns, and even art, architecture and education. Rome, Popes, Inquisitions, Renaissance, Reformation, missionaries, and even the struggle over Jerusalem between two groups that 'deny' him in some way or another are directly attributable to his life.
I've got to stop myself, because we could drink many pots of coffee and tap several kegs of beer and still just scratch the surface of 'what I think'-- and I understand that your thoughts and those of many others are just as extensive.
But to answer your questions more directly:
What do I think he's up to? Delighting in creation. Why are we here? This life is an immersive taste of existence and moreover a test. We will be judged at some point based on the content of our character to determine our more permanent future and access to unimaginable worlds to come!