Website has been down for about 20 hours after activating Cloudflare through BlueHost. Based on diagnostics it looks like it could be a nameserver issue.
How long after creating a new account through Cloudflare do you need to wait until you receive nameservers?
If you did this through BlueHost, the name servers should not change. In which case, you should ask BlueHost for assistance, as this is under their control.