How are atheists certain that there is no evidence for the existence of gods?

to put it simply, the only proof provided to date is a book. theres been no arc, no god making his presence known, or any kind of proof for that matter. were i to see a legitimate sign of god (not jesus ina cracker or crap like that) or the arc that noah built, id believe easily. until any religion brings forth some true proof of there god or higher deity, there is no argument. you cant just expect the world to accept books and tablets as proof of something existing. we write books every day. and i dont see people fighting jedi or riding dragons.