No, J-Walk is not an atheist blog, but it's the Best Blog on the Internet.
However, he has been posting more and more atheistic content, and the comments are steaming hot! The Christian and other fans are not sure what's going on. I think that since the blog is so well-received and popular, this is a great time for him to be linking to blogs like Unscrewing the Inscrutible.
Here's hoping that it doesn't backfire, and he continues his great work.