Everyone has faith. It takes just as much faith to believe in nothing as it does to believe in something.
For most people, there is a feeling that there is a God. But it doesn't really fit into what we can understand, so we use the idea casually.
Some people believe in a human-like God, other believe that God isn't as sentient - "he" is just the name we apply to the force of good in the universe.
In this day and age it's easy not to believe. But the more some philosophers ponder and study the believes of those that came before us, the more we find truth.
Our ancient forefathers, were hardly primitive. They understood deep important things about the world, about society, and about relationships. The more I study ancient Judiasm, the more I personally feel like there is so much there that we are missing.
However, many Christians don't know what it means to be a Christian. We have our faith screwed up. We think that instead of living a welcoming life of love and growth, we have to spend our time convincing others that they need to join us.
We end up oppressing and alienating people - the very things Christ hated.
As for science, it'll prove whatever people want it to prove. For me it, the more beauty and complexity I see in the explaination of how the universe works, the more I believe God.