I'm definately an agnostic. But it should be noted that doesn't mean I don't believe in God. I do - I pray to Him every day. But I believe that the true nature of God is unknowable. Not unknown, unknowable.
I like to use the "cell in the body" analogy. Imagine that each human being is a cell in the larger body of God. We eat, we breathe, we reproduce, we create waste (some more than others :), we grow old, we die. Of course, unlike real cells in the human body, we are self-aware, so we also wonder and worry and question. But we are limited in our perspective - we know only what surrounds us and what we learn through our life experiences. We may be able to understand what it is to be a cell, or what it is to be a blood cell versus a bone cell versus a nerve cell, but we don't understand what the body is for or the context in which God "lives".
To truely understand God, at least in terms of this analogy, we'd not only have to understand how cells work together to enable the body of God, but what God is really up to. Not just the physical reality, but what is he doing every day - and why. However, we as cells in the body of God can no more understand what God is doing than a bone cell in our skull can understand why we worry about our jobs or love our children or debate politics. God exists on a much higher plane - one that is unknowable to humans.
So does that make our lives irrelevant? Of course not - no more that the bone cell is irrelevant to the human body. We live and die and contribute to the health of the body of God. And although we cannot understand the purpose of that body, we can contribute to it - we can be the best, healthiest, strongest cells we can be.
God is, in my opinion, a Spiritual Body. So to complete the analogy, the way we become healthy cells in the body of God is that we become healthy spirits. We create the positive things that make life full and happy like love and compassion and we avoid spiritually destructive things like hatred and jealousy. And spirituality is very much a shared process, so unlike the isolated cells in the human body, we must reach out to one another and share our experiences and our hopes and dreams. In short, we become healthy cells by becoming moral people and sharing our humanity with other humans.
And I believe that when we die, we are transformed. Not that I believe in "life" after death (although I don't deny that's a possibility), but rather "existence" after death. We go on, but we go on in some different form and at some point we join God (whatever that means) and God becomes knowable.
So even though I'm technically an Agnostic, in practice I'm very much like a Christian. And those are my views on God.