I don't know about that.

I mean, I wasn't around when Oden and his brothers, the sons of Bure, used the skull of Ymir their grandfather to make the heaven, but it's there every day when I look.

By the logic of the christian you argue with, that the sky is there is proof positive that heaven (the sky, it's the same word in swedish for heaven and sky) was made as described in the Eddas.