Andy, I already posted what you requested. Ro 1:20.
The evidence comes from God not from me. What good to you is anything that I claim to have witnessed? Or anything the Bible says that others have witnessed? Why should you believe me more than the Bible?
Anyway, God says in the Bible: "And they will have to know that I am Jehovah." If a creator really exists he will prove it. If he does not, means that there is no creator right?