Some good answers in this thread already. The universe needs someone or something to 1) originate it and 2) keep it in existence once it's there, with all its structure. Things change and we see that one moment they aren't, and the next they are. This isn't coming from us, so where is it coming from? Without God you're left without a fundamental explanation.

But you can't really get to faith based on logical reasoning. Ask Him to guide you, read some scripture, look for truth wherever you can.