While I've been reading this thread, I don't tend to participate in these discussions because they generally don't accomplish much. I've said before in many threads that I'm a Christian. To me, the answer to the title of this thread is that I consider Jesus to be my Lord and savior. I do appreciate that you seem to be more fair than many in the way you approach this conversation, but I have to jump in here and say that I think you're just flat wrong in what you've said in this post. Christianity is not an "us versus them" theology. It's a recognition that we're all inherently flawed people and that none of us can be "good" enough to be worthy of living eternally with a purely holy God. Dogma has nothing to do with salvation. Relationship with Jesus does.
That said, I think we all start from the same place when we look up at the night sky and realize just how very large the universe is and how very small we humans are. It's only natural that we ask the fundamental questions of how and why our universe exists and why is there life in at least this little outpost called earth. Atheists seem to want to claim the science mantle and cast those who believe in a creator into the realm of the ignorant and the superstitious. I guess I don't see it that way. The basic question of how did the universe begin can basically be answered in one of two ways: 1. It began through some totally natural process due to unknown and ultimately unknowable conditions that existed outside of our time and universe, since time began at the moment of the universe's creation; or 2. It began when an unknown creator instigated it through unknown and ultimately unknown processes from a point outside of our universe and time. Science, while a great method man has developed for studying his world and universe, has no way of getting at this problem since it invoves things that simply can't be inspected or tested. We can look at our universe and say that it most likely began with a big bang from a single point 14 or so billions years ago, but as to the causality...god or a natural process outside of our reality...there's no test that can exist or will ever exist to deal with that question. I think that there are a lot of reasons to believe that the order of the universe and the fine balancing of it's physical laws that allows it to continue to exist speaks of an intelligent design, but I'll be the first to admit that this is subject to personal interpretation.
Similarly, the questions as to how and why life should exist are unlikely to be resolvable by scientific study. Why and how inanimate elements would be organized into lifeforms having the ability to replicate themselves is something that we have only the wildest of speculation about. When you think of the incredible amount of information contained in the DNA that allows even the simplest of single celled organisms to exist, when you think of how many processes have to exist within a cell simply to allow it to take in food, process it to derive energy, eliminate waste, etc., it seems to me to be pretty far fetched to believe that just happened by accident or through some random physical process.
My belief is based upon my personal journey of thinking about these issues, reading the Bible, talking with others (believers and non-believers), life experiences, prayer, and faith. I can't prove God's existance, but I've felt His presence and seen His actions. I understand and accept that others who do not have the same faith will see my belief as misguided. Frankly, I've long passed the age where I'm too worried about the opinions of others about my thoughts and actions relative to my religion.
Ultimately, I think that our response to what we think about these questions is about as deeply personal of a decision as we can make at humans. I get very tired of seeing people of faith or atheists trying to push their views onto others. I think that we should all have a lot more respect for the thoughts and decisions of other people. I'll gladly discuss my thoughts on these topics with anyone, but I'm not going to try to browbeat anybody into agreeing with me. I appologize for the arrogant actions of some well-intentioned but, I believe, ultimately misguided Christians who show anything but grace towards non-Christians. I do think that it would be nice if some of you here would at least show a bit more respect for those of us who do believe. I fully believe that we should reciprocate with regard to your lack of belief.