Not just because of his work. There is evidence of his existence in many other ways.<quoted text>
His work made him famous. And because of his work there is no denying that he existed. Even though he has been dead for hundreds of years his work lives on. Because of his work you believe in him.
You have seen the work of God yet you deny that hes real and the creator.
No, I have NOT seen the "Work" of God. Why would I assume anything that is tremendously complex, and or, awe inspiring is the "work" of anything? In my opinion that is a very primitive response. I would instead, begin a search for what caused this complexity and beauty and not automatically defer to a God. Almost without exception science gives me the answer for these things, and what it doesn't answer I consider inserting an imaginary being for that answer, foolish. I have studied at great lengths various aspects of science so I can have a better understanding of the world around me. Here is a quote I find so very true. "I am against religion because it teaches you to NOT understand the world around us." And this:....."As soon as you say Goddidit, the journey is over. However when you say I don't know but lets try and find out, then and only then does the journey begin."
I know how stars, planets, moons, comets, and solar systems come to be its common knowledge. I pretty much know how life got its start on our planet. Science does not know exactly all the details, but the basic concept is solid.
God has always been the answer for things man can't understand. Thunder, lightning, tornados, volcanos, tsunamis, sickness. Every time science discovers one of these answers, the "god answer" is replaced with science. Your God has become an ever receding pocket of scientific ignorance. Smaller and smaller, until poof....it will be gone. Oh, I'm sure there will always be people who will cling to the idea that a magical being is responsible for everything in spite of the evidence to the contrary, but that is their loss.