Every song has a composer, every book has an author, every car has a maker, every painting has a painter, and every building has a builder. So it isn't irrational to take this simple logic a little further and say that nature must have had a Maker. It would be irrational to believe that it made itself.
Faith is the first step to understanding. Either it's the Word of an infallible God, the fallible words of men, or faith in what you personally believe. You've got to have faith in something. Believe me.
It is true that you can't prove a negative. However, the existence of God is provable in the same way a building is positive proof that there was a builder.
