Is Gandalf really to blame for Sauron's return?

In The Hobbit, Gandalf assembles the party of 13 to retake the Misty Mountain and give Erebor back to Thorin. However, along the way, Bilbo and company are captured by goblins and Bilbo meets Golum. There's no indication that anyone or anything actually knew of Golum's existence or location until Bilbo met him. Yes, Sauron was already beginning his return, even without the one ring, but had Bilbo never found the ring and stolen it from Golum, it never would have returned to the surface. So, by that logic, since Gandalf was so adamant about Bilbo being the dwarves' burglar and basically guilted him into joining them. Shouldn't it stand that Gandalf is in fact the person responsible for the events of the third age and Sauron's return to power? Had Bilbo stayed home, the ring would have stayed hidden with Golum.